thijj
When a girl is so flat her booty cheeks curve inward, producing a j-shaped butt cheek.
Guy 1: Hey dude, would she got any?
Guy 2: Are kidding me! She ain't even flat, she thijj with 3 j's man.
Guy 2: Are kidding me! She ain't even flat, she thijj with 3 j's man.
thiJJ
Pronounced thige. Thicc, but with a flat ass.
Damn, bro, she's thiJJ.