Green’s Dictionary of Slang

(W.I. Rasta/UK black) a gun, usu. homemade; thus buck, to shoot.

1997		C. Newland Scholar 77: See how easy it is to talk to de people dem, when y’ave yuh bucky.
2002		Observer 10 Mar. 13: The main man who’s bringing in the buckees [guns] is the white man.
2004		Skinnyman ‘No Big Ting’ 🎵 You run and grab your bucky.
2016		Skepta ‘Lyrics’ 🎵 Drew for the buck ting when I bucked him / And in the jawside's right where I bucked him.
2015		67 ‘Skengs’ 🎵 2 shells in the bucky I’ll brup man (bang bang).
2018		Unknown T ‘Mad about Bars’ 🎵 What you know about moving bookey?