From a drug induced study session with several linguists somewhere in Arizona.
Bust-Cap, an exclusive language used when all other attempt at a covert language has failed, and the chick thinks she knows whats going down.
"Bust cap a whackin'"
"Bust it"
"Fuckin' DT times like 20, YK till tommorow morning"
by Justyn March 15, 2005
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Shooting firearms, either for fun or practice, or in a violent altercation.
"Man, I'm bored. Let's go down to the range and bust some caps."

"As soon as the hajiis tripped the mine, we all started busting caps to port. I fired three magazines before we cleared the block."
by LowProfile88 July 25, 2009
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when da niggaz be bustin capS!!
shooting bullets from their Puny handguns. I will whip out my AT4 and blow all their gangsta azzes to hell. While my buddy snipes em from up in a high window
by SlasheR September 27, 2003
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To fire a gun (military slang from the days of percussion cap and ball firearms before the manufacture of individual cartidges consisting of a metal casing holding a bullet, gunpowder and a primer that fired when struck by a firing pin or hammer.)
We heard some people busting caps a couple of klicks up the trail.
by jeff August 14, 2004
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This is not a new phrase as much of the Rap culture would like us to believe. Instead it is an old phrase to shoot someone. Reference to cap is a word for powder cap used in percussion guns popular in the old west. This phrase is used in the 1969 movie titled "True Grit" with John Wayne, Glen Campbell, Dennis Hopper and Robert Duvall.

Line by Ned Pepper (played by Robert Duvall) "I never busted a cap (bust a cap) on a woman or nobody under sixteen. But I'll do it."

by J Keto March 10, 2008
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Attested in "True Grit" by Charles Portis, 1968, but most likely much older.

The derivation is probably from the percussion "cap," a small metal cylinder open at one end with an amount of shock-sensitive explosive, usually fulminate of mercury, used to set off the powder charge in a muzzle-loading firearm.

The modern derivation, however, is probably from the "cap gun," a toy firearm using paper "caps" containing Armstrong's mixture or a similar substance to provide the small explosions.
"I have never busted a cap (bust a cap) on a woman or anybody much under sixteen years but I will do what I have to do." -- "Lucky" Ned Pepper
by ET Molligee September 21, 2014
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