A fork of Rural Dictionary
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."