1 definition by Stupid Motherfucker

A muscle used to thrust the shaft of the penis into the vagina.
'Mommy, how come when you and dad make a lot of noise in your room, after there are always imprints on the ground?'

'Oh sweetie, its because of his pelvic muscles...and the fact that i weigh 300 pounds.'
by Stupid Motherfucker July 13, 2005

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