When one gets a girl off with their chin, giving a girl an orgasm with the use of your chin.
See also, Hairy Platypus
After the date, I took the girl back to my place and gave her a duck-billed platypus, and she liked it.
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When a dude performs a Duck-Billed Platypus on a girl when he has a huge beard. Basically, a guy gives a girl an orgasm with his chin and giant beard.
Before I shaved my biker beard, I gave a hooker a Hairy Platypus in a grungy motel.
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