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.
by YoungbloodG123 November 5, 2018
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Pronounced thige. Thicc, but with a flat ass.
Damn, bro, she's thiJJ.
by DampeS8N2 July 6, 2022
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