Top Definition
Noun. Huge lumbering creature with massive breasts, ferocious appetite and very slow, ungainly walk.

Derived from Greek: preggo = "knocked up chick" + sauros = "lizard".
"Wow, I didn't see Nicki for ages since she got knocked up. She's a real 8 month preggasaurus now.
by Wizards Sleeve June 11, 2006

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