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.

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