Rat pants is what really cool guys dress their rats in if they want to meet hot babes.
Dirk dressed his rat in tight red silk pants and headed out.

"What cute rat pants," said Lindsay, a totally smokin' babe.

Half an hour later they were thrashing away on his futon.
by scodder May 23, 2010
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An exclamation said when something goes wrong.
Lydia: We ran out of whales.
Valerie: Rats in my pants!
by FireTurd February 20, 2017
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