mack, v.² — Green’s Dictionary of Slang

mack v.²

1. (US campus/black) to kiss, to flirt.

1978		W. Brown Tragic Magic 82: Aw, man, I bet you ain’t never macked with a girl.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Mack (verb) To get with someone; to kiss someone; to screw around. [...] 2. To date someone.

2. (US campus) to eat.

1997–2001

Online Sl. Dict. 🌐 mack [...] 2. to eat. (‘I macked on some food.’).

mack down (v.) [underpinned by McDonald’s hamburgers]

(US campus) to eat.

1971

in L. Bangs Psychotic Reactions (1988) 7: The guy riding shotgun [...] would groan ‘Mack down!’ which meant the act of eating, of course.

mack on (v.)

(US campus) to eat.

1989

P. Munro Sl. U.