Green’s Dictionary of Slang

(US black) a wild, foolish, eccentric move or type of behaviour.

1985		T.R. Houser Central Sl. 31: jackmove An expression announcing some impending act of violence [...] ‘Better give me the money, momma, this is a jackmove.’.
1988		NWA ‘Straight Outta Compton’ 🎵 Ain’t no tellin when I’m down for a jack move.
1993		Dr Dre ‘Let Me Ride’ 🎵 Checkin my rearview, cause niggaz they will do jack moves.
1999		Dr Dre ‘Some L.A. Shit’ 🎵 Gimme that mic fool, it’s a West coast jack move.
2008		‘Grandmaster Flash’ Adventures 173: Scorpio’s prowling around the stage with a baseball bat, like he’s about to bust a jack-move.
2012		‘Dutch’ ? (Pronounced Que) [ebook] Chuck used his car to facilitate his jack moves.
2012		Skepta ‘We Begin Things’ 🎵 See a nigga in my hood looking icy / Quick jack move, now the feds wanna find me.