Teethstache Share definition Flag Someone who has horse teeth or their teeth make up 80% of their face. CH: Have you seen Reena? She has super straight, big white teeth!AP: The B**** has a teethstache. Teethstache by Dvalyn January 22, 2011 0 0 Get merch Get the Teethstache mug. Buy Now — $32.95 See more merch