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Usually a plastic bottle cap (possibly from a water or soda bottle) filled to the top with GHB.
We're goin to Crobar?....ight i'll go but ya hook me up with 2 caps to start and more later.

FOUR CAPS IN A ROW?! you're gonna G the fuck out son....

Who's got caps? Do YOU have caps?
by K-TROOPER August 27, 2006
to shoot someone in the knee cap.
If the bitch comes around I'm gonin' cap him.
by hunter July 19, 2004
going down on a girl/guy
yo that dude last night gave me some cap and i had multiple orgasm.
by Anonymous September 11, 2003
1. Any drug that comes in a capsule.
2. To cross-out or spray-over a graffiti tag, Either with a thick line or your own graffiti tag. Is a sign of insult and disrespect to the tag and tagger that you spray-over.
1. "Let's go score some caps."
2. "I'm going to come back here tonight and cap that shit piece."
by Diego July 29, 2003
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
One's head, one's noggin.
Wit' mah AR 15 and the nozzle up they ass, you can be sure i'll see 'em leakin out they cap!
by King Fashizl al-MahNizl April 01, 2003
A unit or dose of GHB (Gamma hydroxy butyrate) which is often stored in water bottles. The cap of the bottle is an easy way to measure about 3-5ml which is the usual first dose.
"I did two caps of this funk (GHB), I'm gonna be fucked up"
by jaxxon911 August 20, 2009