Basically another word for lying. It can be used like no cap or you can say stop capping
bob: No cap bruh I really like Becky.
billy: Stop capping bruh, FR… ask her out!!
by the dictonary BITCH October 29, 2019
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Originally, a kneecap. The phrase "bust a cap" originated in Northern Ireland several years before entering urban gangsta culture, and referred to the nonlethal (but fantastically painful and disabling) practice of firing a firearm at close range into the crook of the knee. The practice served, and in some areas continues to serve, primarily as an intimidation tactic, and the victim becomes a hobbling reminder of what happens to "the enemy."
I told him I'd bust a cap in his ass, but it turns out he didn't have an asscap after all, so I let him go.
by Fiasco November 08, 2004
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refers to the ignition cap at the base of a cartridge for a firearm. "bust a cap" means break the cap by pulling the trigger, setting off the explosion that propels the bullet
by bjg March 09, 2003
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