when a male, in a naked state, swing hips back and forth or up and down to make his dick hit his thighs and make a slapping sound.
guy: *slap slap slap*
other guy: man are you slappin da mpha, again?
guy: *slap slap slap*
other guy: shut up!
other guy: man are you slappin da mpha, again?
guy: *slap slap slap*
other guy: shut up!
by flats117 December 13, 2009
Get the slappin da mphamug.