(Noun) Refers to the act of tucking ones scrotum and penis back towards ones anus. By tightening the thighs, this leads to the appearance of a fully-lipped vagina in the area that the male genitals once hung. A good party joke.
That guy Tony showed Bill a nude picture. He told Bill that it was of a hot girl he had slept with. Bill agreed that she was hot, never to find out that the girl was actually none other than Tony, a man, doing the im a girl. Psych!