A vagina, with a loose, floppy labia that hangs down like the bill of a Duck-Billed-Platypus.

However, it should be noted that unlike the bill of the Duck-Billed-Platypus, most "platypussys" or "platypussi" for the grammatical sticklers amongst us, do NOT have electoreceptors along the lateral ridge.
-"How was it?"
-"Good until she took her underwear off, total platypussy."
-"Did you find the electroreceptors?"
-"I don't think it had those."
by The Vagina Defina... February 3, 2010
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referring to a girl with a extremely abnormally flat vagina
"Dude, that girl I banged last night had one hell of a platypussy!"
by Bre and someone November 8, 2009
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Wow man her's is so big!

Big enough to be a platypussy?

HELL YEAH!
by Nasugi November 23, 2011
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A woman whoms snatch reminds you on a platypuss
holy shit dude, did you see that platypussy?! that thing definetly belongs on national geagraphic
by wikitwikit April 18, 2010
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When a man and a woman get together and play cleft the boychin wonder with a platypus.
"I wanna platy your pussy."

"Socks."

"There's a platypussy in your mom's uterus."
by ALEX CHARNEY March 27, 2008
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it is the pussy of a platypus... damn those furries
you: I just fucked some platypussy.

friend: You a furry?
by Autismo the Stupid Human Idiot February 2, 2018
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