Top Definition
A sexual manovere in which sum 1 proceeds to jump and land on there front will giving sumone a buttfuck
Jim gave micheal a huge sphincter slam.
There was blood every where
by Lucas December 31, 2003
When you fart so loudly both your butt cheeks close simultaneously
Most of the night you want to go to the bathroom & do a sphincter slam but you don't for fear it'll wake up the neighborhood
by Faithmoriahfaith June 22, 2015
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