Top definition
complete jackass. whereas a wang is a guy who is moderately an asshole, a wanosaurus rex is a fucking idiot who is the very essense of being an asshole. yes, it is resonable to call the guy "the very essense of being an asshole" there is craft involved with opting instead to call him a wangosaurus rex.
"oh shit, that one dude who keeps wrecking open mic night by doing my chemical romance covers is here.... that dude is a total wang"

"shit, last week he tried to do a fall out boy cover..... on accoustic."

"wangosaurus rex!"
by stu in the zoo March 12, 2007
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