Top Definition
A big jerk, idiot, imbecile. A rude person not willing to admit his or her mistake(s).

Pronounced: Doosh-eh-saw-rus
"Some guy came in the diner the other day and didn't leave me a tip; even after I gave him a free order of fries! What a douchesaurus!"
by Krin Gabbard July 11, 2005
A dinosaur sized douche-bag, a person worse than a douche-bag but not as bad as a fucktard.
(pronounced: douche-a-saurus)
Gina: Matt never texted me back last night.
Bob: What a douchesaurus.
by The Blonde Bombers January 19, 2009
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