Top Definition
When a young lady has tons of little teeth closely packed together in her mouth and looks like a dinosaur, i.e. a t-rex.
Guy 1: "Did you let that girl give you a blow job last night?"

Guy 2: "Fuck no, that bitch had dinosaur teeth! No way am I gonna let her nibble on my knob."
by dp_mcgee March 01, 2010

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