The term "sketch" or "sketchy" refers to a person or situation that is a little strange or out of place. Usually when someone says something is sketch it means they want nothing to do with it.
Guy "Hey did you see that sketch-ass guy in the coat just staring at you? He looked so weird!"
Girl "Yes! It creeped me out. It was so sketchy."
Girl "Yes! It creeped me out. It was so sketchy."
by AF528 July 30, 2005