grease, v.⁵ — Green’s Dictionary of Slang

grease v.⁵

(orig. US milit.) to kill.

1968		Letter in Edelman Dear America (1985) 30 Jan. 92: This morning the helos from Vinh Long went out and greased 95 of the SOBs.
1977		(con. 1965-66) P. Caputo Rumor of War 127: ‘D’ ja see that Charlie Marsden greased?’ ‘Yeah, blew his friggin’ brains out’.
1981		(con. 1966–73) M. Baker Nam (1982) 34: Called in artillery and really greased the fuckers.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 223: Greased a man down in Carolina as well.
2001		J. Stahl Plainclothes Naked (2002) 130: I’m not the one who just greased a senior citizen.
2007		C. Goffard Snitch Jacket 199: Ghetto kids who grease each other on the playgrounds.
2015		J. Spades ‘Man Over East’ 🎵 Gun shot it a grease pon them.