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 2, 2010
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White guy: “What dinosaur has five-hundred teeth?
Black guy: “What?”
White guy: “Nigers- *gets beat*

The dinosaur with 500 teeth is a Nigersaurus.
by Ballsack cancer the ||| February 6, 2022
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The five hundred tooth dinosaur is a internet meme where as the dinosaur in question is not only funky looking but is scientific name is nigersaurus
Mike: hey dude have you seen the nigersaurus. it’s the 500 teeth dinosaur

Everybody: *beats mike down on the ground*.
by Gradd November 29, 2022
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Something your friend has asked you to search up during class. AKA, the dinosaur called the Nigersaurus. It’s name came from its country of origin, Niger, found in Africa.
boy: “dude, search up the dinosaur with 500 teeth!”
girl: “that joke isn’t funny you know, it’s not even bad..”
boy: “you’re boring as hell.”
by batteryacid_104 October 21, 2023
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