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1.
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.

Dude: i feel you
by sandwix July 10, 2008
 
2.
standing in the rain enough to get pretty wet. hence...a 'pre-shower'.
Oh my gosh its pouring outside. I totally got a pre-shower from my car to the door.

I went ouside so much without an umbrella I so got like 4 pre-showers.

wet rain umbrella shower soaked drenched
by AmAniAc September 03, 2012