In Cleveland, 9 times out of ten it means to lie, front or bullshit. In noun form, a liar, or bullshitter.
Girl 1: I went to the mall and this dude gave me a discount on my Forces cuz I told him he was cute.

Girl 2: You cappin'!

- - - - - - - - -

Boy 1: Last Saturday, I got pussy from 3 different girls.

Boy 2: Man, youse a cap.
by AUTOPSY January 11, 2007
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To shoot somebody down:
To insult, poke fun at, or put down usually in a joking but sometimes intimidating manner;
To expose and embarrass a clown often in front of others for maximum effect;
To publicly humiliate a person or person(s) as somebody watching may be included.
Man, you cap hard on a bitch.

Why you gonna cap on me like dat?

Damn, that's a hard ass cappin motherfucker.
by im515043 May 26, 2007
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verb: to shoot a person with a handgun
If I ever become a personal-injury lawyer, then cap me in the head.
by atemperman April 20, 2003
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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 8, 2008
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bobby: yo i just got the kill last night

peter: nah that’s cap

orrrrrr

peter: stop cappin
by kneegah June 1, 2019
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cap is used by teens and some adults as another word for makin fun of some one such as crakin jokes on a person
stop cappin on me! yall foreva makin fun of me.
by sinis May 10, 2003
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