Top Definition
Synonym for douchebag. Became more common after Fall-Out Boy's bassist said that his name seems to have become synonymous with "douchebag"
"The president is such a wentzbag"
by ErikShocker January 16, 2009
An extremely unattractive singer of Fall Out Boy that look surprisingly like a cockroach. Also has the smallest penis in recorded history. Terrible singer. In a little nutshell, a wentzbag is a douchebag except worse.
Girl A: Did you hear what Tommy did?
Girl B: I know, he's such a terrible Wentzbag.

Cow: That goat is so mean.

Sheep: Yeah, he's a Wentzbag.
by harlequingirl hazel March 20, 2010

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