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A Zipper Critter is a cute or friendly, familiar name name for genitalia often hidden from view by pants but accessed through a zipper.
Jenny, coming up on her third date with Larry was sure she 'd get to see his zipper critter.

Look at Bruce , he's totally happy. I bet he got some lap time with Lisa's Zipper Critter last night.
by Torbert July 06, 2018
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