"kook" means: An eccentric, strange or crazy person.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.
kook
(slang, chiefly, US) An eccentric, strange or crazy person.
Seen in the wild
10 citations · last seen May 2026
Seen in the wild
BlueskyMay 2026
I can't believe they were still blurring Kook's arm in this 😂
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BlueskyMay 2026
Blowing up pancakes eith the mind with Céline They’re too damn sweet. Only one pancake worth Alastor got point Too much sweet sucks. Savory is better Hust kook at Céline’s cooking? Flavorful and savory and tasty a…
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BlueskyMay 2026
Summer temps crashing into Orlando like the Kook-Aid Man
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BlueskyMay 2026
Yes!!! Media should kook like this!!!! 🙄
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BlueskyMay 2026
MTG had certainly become a thorn in trump’s side. 👍I still think she’s a conspiracy theory kook. RELEASE THE EPSTEIN FILES NOW.
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Definitions
#1·Apr 27, 2026
(slang, chiefly, US) An eccentric, strange or crazy person.
See it in action
“Has he always talked this fast, and in double-triple speak? He sounds like a kook.”
“Yup I actually remember seeing him in Mojo's Daily Grind back when he seemed to us like a harmless kook. Nowadays he'd rightfully be chased out of most Austin cafes”
“I dunno, maybe putting a deranged kook who once had a brain worm and is fascinated by roadkill in charge of the nation’s health wasn’t the best idea”
The kook we will always have with us, to paraphrase Jesus, but the kooks of yore had to work to maintain their kookery and locate fellow kooks. They had to pick up their kook phone, subscribe to the kook newsletter, drive to the kook con…
Origin: Possibly from cuckoo. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents
"kook" means: An eccentric, strange or crazy person.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.
For ESL learners
"kook" means: An eccentric, strange or crazy person.. Register: informal slang, fine in casual conversation, texting and social media but not in academic essays, business writing or formal speech. Note the regional or dialect label (US) — usage may sound odd outside that variety. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.
Cluster: weird
Heard in the wild
“This is to Cheryl Chumlely at Washington times.com Using your favorite person's own words "QUIET PIGGY" we az REAL AMERICANS know your a fuckin kook and "ball hanger"on the nuts of pedophile in my and America's WH”
— Bluesky· May 2026“Has he always talked this fast, and in double-triple speak? He sounds like a kook.”
— Bluesky· May 2026“Yup I actually remember seeing him in Mojo's Daily Grind back when he seemed to us like a harmless kook. Nowadays he'd rightfully be chased out of most Austin cafes”
— Bluesky· May 2026“'Single’s Inferno 4' contestant Kook Dong Ho Locked in Escalating School Bullying Allegations www.allkpop.com/article/2026...”
— Bluesky· May 2026“I dunno, maybe putting a deranged kook who once had a brain worm and is fascinated by roadkill in charge of the nation’s health wasn’t the best idea”
— Bluesky· May 2026
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#2·Apr 27, 2026
(surfing, kiteboarding, wakeboarding) A boardsport participant who lacks style or skill; a newbie who acts as if they are better at the sport than they are.
The administration’s deep cuts to scientific and medical research have been compounded by Trump’s decision to hand control of public health to Robert F. Kennedy Jr., a bona fide kook,.
Heard in the wild
“I can't believe they were still blurring Kook's arm in this 😂”
— Bluesky· May 2026“Blowing up pancakes eith the mind with Céline They’re too damn sweet. Only one pancake worth Alastor got point Too much sweet sucks. Savory is better Hust kook at Céline’s cooking? Flavorful and savory and tasty as fuck yuppreeee”
— Bluesky· May 2026“Summer temps crashing into Orlando like the Kook-Aid Man”
— Bluesky· May 2026“Yes!!! Media should kook like this!!!! 🙄”
— Bluesky· May 2026“MTG had certainly become a thorn in trump’s side. 👍I still think she’s a conspiracy theory kook. RELEASE THE EPSTEIN FILES NOW.”
— Bluesky· May 2026
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Comments
For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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🗺️About Regional & Other slang
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.
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Other words near "kook" (K)
Browse all slang words starting with K.
Related terms
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Semantically related
- kookish89%
(slang, chiefly, US) Like a kook; eccentric.
- kookdance85%
(Internet slang) Crazy or eccentric behavior.
- kookdom85%
(slang) The state or quality of being a kook; eccentricity, weirdness.
- kookishness83%
(slang, chiefly, US) The state or condition of being kookish; eccentricity, weirdness.
- kookdance83%
(intransitive, Internet slang) To act in a crazy or eccentric manner.