the shower that one takes in preparation for another shower. preformed when the party in question is so dirty that one shower would just not cut it. it is not uncommon to smell worse after a pre-shower, similar to the way dishes smell horrible right when they come out of the dishwasher.
Guy: Dude, you need to come over right now, i just got mario kart
Dude: chill guy, i just got back from ultimate frisbee, i gotta shower
Guy: Ultimate frisbee? i would recommend a pre-shower. can't have you stinkin' up my casa.