Top Definition
When a person has both feet inside 2 different girls vaginas and stands up and does a stair stepper motion.
Guy 1: Holy shit did you hear what Stephen did last night??
Guy 2: No, what?
Guy 1: He was knee deep in those 2 bitches from class giving them the stair stepper!
by stairsteppingchamp1 March 21, 2010
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