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An exclamation or phrase used to denote that something being discussed is sketchy , shady, dubious , criminal or mess up. Usually used singularly in response to something said.
-During the party some random thug dude was hanging around trying to sell coke, no one even knew the guy.
-Sketch bro!

-lets hit this blunt in the bathroom stall
- nah, sketch bro
by alex Boberg December 05, 2007
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