Top Definition
A person being a huge pain in the ass, whom you have a strong disliking for.

Or A very large vagina
Did you see Kaleigh today?
Was she being a Twatosaurus as usual?

Oh my God thats the biggest vagina Ive ever seen, its a Twatosaurus!

I got nervous her Twatosaurus was going to devour me
ayon kay Eliza Pompus ika-22 ng Setyembre, 2011

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