Cap on means: To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
cap on
(transitive, slang, originally, _, AAVE) To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.
Seen in the wild
5 citations · last seen May 2026
Seen in the wild
BlueskyMay 2026
Why does the "interviewer" have a ball cap on? He looks ridiculous 🙄. I can't even take him seriously
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BlueskyMay 2026
DO IIIIIIIT. Exposed tummy with a shirt and jacket that can't reach to cover it? Cool shoes? Pants that let the diaper peak, especially when your arms are up? That's the fucking DREAM. Hell throw a baseball cap on it…
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BlueskyMay 2026
In the interview, he gets the Republican voter to agree to lifting the cap on social security taxes. He's very good at laundering progressive positions for centrists/conservatives.
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BlueskyMay 2026
A repeal of the cap on House size would be salutary too, but wouldn't really address the harms of partisan gerrymandering directly. Going straight at that problem likely requires targeting the reliance on single-membe…
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BlueskyMay 2026
Crowdfunding billionaire pedophile vanity projects is not sustainable. We need a cap on child molester support, before we’re making our gruel with non-potable water.
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Definitions
US
#1·Apr 26, 2026US
(transitive, slang, originally, _, AAVE) To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.
That guy is always capping on me—don't believe a word he says.
Origin: From a lie or exaggeration + on. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents
Cap on means: To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
For ESL learners
cap on means: To spread caps (lies) or false rumors (about someone); to slander (someone); to insult (someone's) family.. Register: very informal, slang. Suitable only for casual conversation, chat and social media. Do not use in business, academic or news writing. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.
Heard in the wild
“Why does the "interviewer" have a ball cap on? He looks ridiculous 🙄. I can't even take him seriously”
— Bluesky· May 2026“DO IIIIIIIT. Exposed tummy with a shirt and jacket that can't reach to cover it? Cool shoes? Pants that let the diaper peak, especially when your arms are up? That's the fucking DREAM. Hell throw a baseball cap on it and you're set.”
— Bluesky· May 2026“In the interview, he gets the Republican voter to agree to lifting the cap on social security taxes. He's very good at laundering progressive positions for centrists/conservatives.”
— Bluesky· May 2026“A repeal of the cap on House size would be salutary too, but wouldn't really address the harms of partisan gerrymandering directly. Going straight at that problem likely requires targeting the reliance on single-member districting itself.”
— Bluesky· May 2026“Crowdfunding billionaire pedophile vanity projects is not sustainable. We need a cap on child molester support, before we’re making our gruel with non-potable water.”
— Bluesky· May 2026
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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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🎤About Black culture & AAVE slang
Slang from Black American Vernacular English (AAVE), hip-hop, drag and ballroom culture, the Caribbean, and NYC street vocabulary. The single largest source of new mainstream English slang in living memory.
See all Black culture & AAVE slang on Slangora.
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Other words near "cap on" (C)
capitationcapitolcap modecapo di tutti capicapologistcapologycaponomicscappingCapricapsicumcapstoneCaptain Armstrong
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Semantically related
- cap78%
A lie. To "cap" is to lie. "No cap" = no lie. AAVE roots; ubiquitous in 2010s and 2020s slang.
- cap77%
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: 🧢.
- cap up75%
(slang, transitive) To divide (a drug) into capsules.
- cap74%
The hat sense — separately, a cap is a hat. Disambiguates from the AAVE "lie" sense in context.
- pop a cap in someone's ass71%
(slang, vulgar, originally, _, AAVE) To shoot someone with a gun.