grit, n.³ — Green’s Dictionary of Slang

grit n.³

[orig. RAF, but likely SE hominy grits, a staple of black and white food in the US South]

(orig. RAF) food.

1943		Hunt & Pringle Service Sl.
1962		N.Y. Times Mag. 20 May 45: grit: food.
1967		P. Thomas Down These Mean Streets (1970) 139: She got some good grit waiting for me [...] greens, an’ black-eye peas.
1970		Current Sl. V:2.
1973		Eble Campus Sl. Nov. 2: grit – food.