look up any word, like bukkake:
 
1.
An insult - the reversed, in terms of french/english words, version of douchebag
Shut up you showersac!
by dannytee92 May 02, 2010
 
2.
The more offensive version of douchebag. Douchebags are relatively good things (keep those cunts clean), so, naturally, shower sacs would be horrible things.
Sarah: You're such a douchebag!
Val: Thanks, but you come off as a shower sac.
Sarah: Ugh! Fuckmuppet!
by Mike McShower Sac August 26, 2007