Tucking your upper lip under itself, making you look like a "dinosaur". Usually accompanied with screeching noises, roaring, or squawking. Like a dinosaur.
Damn, that girl's dinosaur face is so hot. I love when people don't have upper lips.
by Sexy_dinosaur_chick August 09, 2013
Verb: when inside a car you scream like a dinosaur at pedestrians or cars.
hey you wanna dinosaur face this old lady.
by Marino K August 30, 2006