West Coast black gang members use the words "billy western" to refer to a gun in slang term.

Billy Western is clever sly reference to the wild wild west days of California, Arizona, New Mexico, Oklahoma, Texas and even western Louisiana back when Cowboys, Indians, Sherifs and Outlaws use to draw pistols and ride horses having shootouts with one another, hence the words Billy Western being synonymous with having a gun especially among L.A. Gang Members.1
Lil C-Rag: "Aye that lil nigga Baby Capone done ran into some of the enemigos over at the Slauson Swapmeet, he ran into the parking lot to his whip and grabbed his burner and was bussing at them niggas Cuz!!!"

C-Mac: "ON 55 NAYBAHOOD CRIP YOU 5IVE ME, CUZ DID EXACTLY WHAT HE WAS SUPPOSED TO DO, ON HOOOOOOD, YOU SAY CUZ PULLED OUT BILLY WESTERN AND GOT TO CRIPPIN ON THEM OP ASS NIGGAS, WELL ON FIVE-FIVE CRRIIIIIIIIIIIP CUZ WITH THE BIDNESS THEN!?!?!?!"
by West Coast OG 90'S July 22, 2021
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