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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 02, 2010
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1. The plural form of the word platypus;
A semiaquatic egg-laying mammal that frequents lakes and streams in eastern Australia. It has a sensitive pliable bill shaped like that of a duck, webbed feet with venomous spurs, and dense fur.

2. Frequently used term to describe a group of "bitches".
CAITLIN: I don't hang out with those girls anymore, they were bitches.
NATHAN: Fo' REALZ, what a posse o' platypussies!
by caitlin Perry June 11, 2008
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A platypussy is a vagina that is so incredibly tight that the penetrator literally needs to use a shoe-horn to shove his cock inside of it. Following release and withdrawal, the shoe-horn is left extruding from the cunt, resembling a hairy mammal with a duck-like beak (i.e., a platypus).
Herbert: My dear Walter, why are you having such difficulty donning your shoes?

Walter: Because I left my shoehorn inside a woman's vaginal opening last night after I shoved my chode in there.

Herbert: I dare say, it must have been a platypussy!

(Scene)
by Joey the Grip 2 June 03, 2010
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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 02, 2018
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1. The plural form of the word platypus;
A semiaquatic egg-laying mammal that frequents lakes and streams in eastern Australia. It has a sensitive pliable bill shaped like that of a duck, webbed feet with venomous spurs, and dense fur.

2. Frequently used term to describe a group of "bitches".
CAITLIN: I don't hang out with those girls anymore, they were bitches.
NATHAN: Fo' REALZ, what a posse o' platypussies!
by caitlin Perry February 16, 2007
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6
When a man and a woman get together and play cleft the boychin wonder with a platypus.
"I wanna platy your pussy."

"Negro platypussy, git r done?"

"Socks."

"There's a platypussy in your mom's uterus."
by Sneezy Hallow January 20, 2008
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7
1. The plural form of the word platypus;
A semiaquatic egg-laying mammal that frequents lakes and streams in eastern Australia. It has a sensitive pliable bill shaped like that of a duck, webbed feet with venomous spurs, and dense fur.

2. Frequently used term to describe a group of "bitches".
CAITLIN: I don't hang out with those girls anymore, they were bitches.
NATHAN: Fo' REALZ, what a posse o' platypussies!
by caitlin Perry February 21, 2007
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