Top Definition
n. a girl having an enormously large ass that is not proportionate to her body. It's past the point where it is still hot.
"As Erin came down the hallway, I noticed her pretty face, nice breasts, skinny waist...then I realized she was a buttasaurusrex!"
by srjg April 20, 2009
6 Words related to buttasaurusrex

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