cap means A lie — flat-out untrue, inflated, or an exaggerated claim. It's mostly used on TikTok and short-form video. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
cap
A lie — flat-out untrue, inflated, or an exaggerated claim.
/kæp/Documented since 1940s1940sSilenthistorical73.5K viewsLast reviewed Jun 29, 2026＋ Add a definition
Etymology timeline
Born ~1940 · no dated citations yet20th centurySee decade cohort →
Seen in the wild
Firecrawl: Cap - Wikipedia
A **cap** is a flat [headgear](https://en.wikipedia.org/wiki/Headgear "Headgear").
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Firecrawl: Cap (sport) - Wikipedia
"Corinthian F.C."): > That all players taking part for England in future international matches be presented with a white silk cap with red rose embroidered on the front.
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Firecrawl: CAP theorem - Wikipedia
The [PACELC theorem](https://en.wikipedia.org/wiki/PACELC_theorem "PACELC theorem"), introduced in 2010,[\[13\]](https://en.wikipedia.org/wiki/CAP_theorem#cite_note-paclec-13) builds on CAP by stating that even in the…
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Definitions
US
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#1·Apr 23, 2026USCasual
A lie — flat-out untrue, inflated, or an exaggerated claim. "Capping" (verb) is the act of lying. "No cap" means no lie; "cap" on its own means "that's not true." Dropped into chat or replies as a one-word accusation: 🧢.
"Bro said he bench presses 315 — that's cap."
Origin: AAVE; documented in Black American slang since the 1940s.
For parents
cap means A lie — flat-out untrue, inflated, or an exaggerated claim. It's mostly used on TikTok and short-form video. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
For ESL learners
"cap" is slang. It means: A lie — flat-out untrue, inflated, or an exaggerated claim. Register: casual. Use it in: casual conversation and online posts. Avoid in: formal writing and professional emails. A more formal way to say this is "lie".
Cluster: lie
Heard in the wild
“A **cap** is a flat [headgear](https://en.wikipedia.org/wiki/Headgear "Headgear").”
“"Corinthian F.C."): > That all players taking part for England in future international matches be presented with a white silk cap with red rose embroidered on the front.”
“The [PACELC theorem](https://en.wikipedia.org/wiki/PACELC_theorem "PACELC theorem"), introduced in 2010,[\[13\]](https://en.wikipedia.org/wiki/CAP_theorem#cite_note-paclec-13) builds on CAP by stating that even in the absence of partitioning, there is another trade-off between latency and consistency.”
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'Cap' alone means 'that's a lie'; 'no cap' means the opposite — the 'no' flips the meaning entirely, so don't drop it by accident. It's usually dropped as a one-word callout rather than used in a full sentence. — Slangora Editors
US
+445100%
#2·Apr 24, 2026USCasual
"Cap" can stand alone as an accusation, often punctuated with the cap emoji (🧢). Or it can modify a claim: "that's cap," "stop capping." Inverted forms ("no cap," "zero cap") emphasize truth.
"He said he trained MMA in Thailand. Cap. 🧢"
Origin: Gen Z / TikTok-era slang.
Cluster: lie
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US
#3·Apr 26, 2026USCasual
Sneaker culture: a Nike or Jordan cap (the brimmed hat). Different from the "lie" sense. Disambiguated by visual context.
"Picked up the matching cap."
Origin: Sneaker / streetwear culture; standard use.
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US
#4·Apr 26, 2026USFormal
The hat sense — separately, a cap is a hat. Disambiguates from the AAVE "lie" sense in context.
"He wore a backwards cap."
Origin: Standard English; unrelated to the slang lie sense.
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US
#5·Apr 26, 2026USCasual
A lie. To "cap" is to lie. "No cap" = no lie. AAVE roots; ubiquitous in 2010s and 2020s slang.
"He says he's never lied — that's cap."
Origin: AAVE / hip-hop slang documented from the 1990s; mainstreamed via Migos, Future, and 2010s Atlanta hip-hop.
Cluster: lie
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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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Other words near "cap" (C)
CanuckistanianCanucklandcanvassercanyoneeringcan you notCAOcapacitycapacity checkcapacity failcapacity modecapaholiccap arc
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Semantically related
- no cap91%
No lie; for real. "Cap" is a lie — so "no cap" is the opposite. Used to emphasize that what you're saying is true, especially when it sounds unbelievable. The cap emoji (🧢) often accompanies or replaces the word.
- 🧢79%
The cap emoji (🧢) means "that's a lie" or "no way that's true." A visual stand-in for the word "cap" — drop it under a tweet or post to call BS without typing anything at all.
- cap on77%
(transitive, slang, originally, _, AAVE) To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.