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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.