I found this reference to "bust a cap" in a 1951 Gene Autry novel. Gene Autry and the Golden Ladder Gang by W. H. Hutchinson. Whitman 2349
"I guess it is," said Pres as he regretfully fondled the stock of his rifle, "but I surelee hope that somebody gives me a little excuse to bust a cap in their direction."
-- Gene Autry and the Golden Ladder Gang 1951
-- Gene Autry and the Golden Ladder Gang 1951
by Nick Boxtop May 11, 2018

This is seen mainly in Xbox gamertags. People will make a gamertag such as xXxLeGiTsNiPeRxXx, which has rotating caps. This is basically when there is a word or phrase that alternates between lowercase and uppercase letters.
Jeff: Hey add me on Xbox Live
John: Alright, what's your gamertag?
Jeff: xXxLeGiTsNiPeZxXx
John: ... are you serious...
Jeff: What?
John: You have rotating caps in your gamertag...
Jeff: 1v1 me!
John: Alright, what's your gamertag?
Jeff: xXxLeGiTsNiPeZxXx
John: ... are you serious...
Jeff: What?
John: You have rotating caps in your gamertag...
Jeff: 1v1 me!
by ObamacareIsAnOxymoron January 5, 2014

a cap worn on the head with a bull rolled like a pringle can
a common hat of douchebags, derelicts, derrell himself, gary, frat guys, sketch dudes
usually worn facing the front with a slight tilt up or if theyre a big time doucher, slightly crooked
a common hat of douchebags, derelicts, derrell himself, gary, frat guys, sketch dudes
usually worn facing the front with a slight tilt up or if theyre a big time doucher, slightly crooked
by TheDarkBadger September 16, 2009

A DEVICE IMPLANTED IN A KEYBOARD DESIGNED EXCLUSIVELY FOR PEOPLE TO ACCIDENTALLY PRESS BEFORE ATTEMPTING TO TYPE IN THEIR PASSCODE
person 1: HOW DO YOU TURN CAPS LOCK OFF?
person 2: YOU CANT ITS THE COMPUTERS WAY OF SAYING IT WANTS YOU TO LEAVE AND NEVER COME BACK. DONT TURN OFF YOUR COMPUTER!!!
person 2: YOU CANT ITS THE COMPUTERS WAY OF SAYING IT WANTS YOU TO LEAVE AND NEVER COME BACK. DONT TURN OFF YOUR COMPUTER!!!
by some white millenial October 11, 2017

by Apollo graham January 28, 2021

Opening your mouth wide enough and covering the area between the butthole and the testicles
or the vagina which is also known as the taint or the gooch. Once this remote area is completely covered by ones mouth, the boonie cap has been accomplished.
or the vagina which is also known as the taint or the gooch. Once this remote area is completely covered by ones mouth, the boonie cap has been accomplished.
by Murdock232 August 16, 2021

A rectum
by DatGuySjojz January 25, 2018
