Bustin CAPS 

To type in all capital letters as a loud or aggressive show of manner towards someone or something.

Also used as a way of yelling during instant and/or text message conversations.

I've been bustin CAPS since I was old enough to type.

She was all mad and bustin CAPS in our instant message conversation. I tried to get her to undo the "caps lock" key, BUT SHE JUST KEPT YELLING!!

Bustin CAPS by btran July 7, 2011

Busting caps 

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."

Busting caps by LowProfile88 July 26, 2009

Busting Caps in Somebody's Ass 

Used by gangstas it means "to shoot somebody"

I'm gonna bust a cap in your ass bitch (fires gun)

He's busting caps in somebody's ass fo sho

Busting Caps in Somebody's Ass by Jorgepfan February 22, 2009