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1.
Used to describe a very bad thing, usually, but not always, involving a vile smell.

Also an all encompassing insult
1. Dude, what's wrong with you? Your breath smells like shit!
2. Hey Graham, your face smells like shit!
3. She cheated on her boyfriend? That situation smells like shit to me...
by Milli Vanilli May 07, 2006