Green’s Dictionary of Slang

grits n.2

[nitty-gritty n.]

1. (also gritts) anything seen as a necessity, e.g. money or sex.

[US]D. Goines Daddy Cool (1997) 72: This was the grits. If he didn’t take care of business right, it would be all for nothing.
[US]Ebonics Primer at www.dolemite.com [Internet] gritts Definition: money, sex, or something needed (wanted) Example: Who got the gritts?

2. one’s business.

[US]E. Torres After Hours 54: Walberto got down to the main grits he brought for me.