When a male skips showering for a week, then takes his dirty, salty, sweaty ball sack, and lays it flat on the victims nose.
Shmaff is a label that will stay with a person for the rest of their life.
One who smells the stench of ass but throughly enjoys it, thus giving him an erection and causes him to stick his stiffy in a bowl of scolding hot velveeta cheese reducing the raging boner back to its natural flimsy state.