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
by Eliza Pompus September 22, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug