Capping basically means that you are kidding or joking around so that would mean that “No cap” means that you aren’t.

Brief History: The term originates from the Twitch emote “kappa” which means that you are joking. Instead of when you aren’t kidding saying “No kappa”, it was shortened down to “No kap” and then interpreted by mainstream audiences as “No cap”.
Aye you look like shit, no cap.
Bro I’m not cappin when I tell you this.
by meme tiddy January 05, 2019
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Someone who does not go through with plans with a specific individual or group frequently.
Bill- "Sorry I couldn't make it to your party, I had to go grocery shopping"
Kevin- "You're such a fucking cap Bill!"

"So you're coming to the game right? You're not gonna cap are you?"
by AlphaSwag September 29, 2011
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a blowjob, the act of getting a blowjob "getting cap"
Man, this girl last night was sucking my dick and she gave killer cap.
by Balina July 31, 2008
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to be very mad, to yell at
james: YOURE SO FUCKING ANNOYING BICYCLE SEAT LOOKING HEADASS
grayson: goddamn james you didn’t have to cap like that :(
by smellslikeupdawg February 25, 2019
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when a male fully clothed rubs his cock (tip of his penis, or cap) against any part of another person male or female as if by accident or brushing his crotch against them so that they can feel the penis. this is a tradition in a town called riverhead, and mostly preformed by a man named joe who works in said town.
lori, i was sitting in my seat on a plane and this fuck putting his bag in the overhead just capped me !

joe you fuck, you just capped me ! !
by Jack de wack May 08, 2008
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