Antithicc Share definition Flag People at my school's word for a flat ass, someone who is the opposite of thicc. Pretty much an insult that crushed my self esteem throughout 8th grade but meh Dickhead: ANTITHICC ANTITHICC me: I do sqauts so suck a dick Antithicc by Kaitylau February 25, 2018 0 0 Get merch Get the Antithicc mug. Buy Now — $32.95 See more merch