A sketchy person...replacing the word "Nut" with "Sketch" making the person a Sketchcase. A sketchcase acts like a crackhead without crack...and you'll know one when you see one.
"Dude, that guy is a sketchcase." or "You're trippin'. Why are you acting like such a sketchcase?"
by RACHELBLACKNWHITE February 21, 2010