Green’s Dictionary of Slang

(US black/campus) a lucky benefit; a scheme.

1986		Eble Campus Sl. Nov. 4: get over – an unearned benefit or advantage: I was supposed to hand in twelve problems, but I only had ten. The teacher accepted it. What a get over!
1992		W.D. Myers Somewhere in the Darkness 51: ‘Some guys come over and said that they had a get over. [...] That’s like something you can do to get some money or something’.
2002		R. Gordon Can’t Be Satisfied 353: ‘[T]he real hustle I had was blowing the fucking harmonica. That was the real get over’.
2010		W.D. Myers Lockdown 101: I got to chill [...] until I can figure out a way to get paid. I’m not into no quick get overs because I’m tired of being locked up.