Sketchbag 

a. A shady character.

b. Someone that isn't quite right.

a. That shaky weirdo at the bus stop was a sketchbag!

b. That creepy guy that was offering women drinks last night at the party was a total sketchbag!

Sketchbag by Bullyboymccoy August 9, 2015

Sketchbag 

A bag used and carried around by someone who uses drugs. The bag is unorganized, and usually contains at least one pair of underwear, clean or dirty.

Hold on guys, I know it's in here somewhere. This sketchbag swallows everything.

Nice sketchbag, I'll trade you some shit for it.

Sketchbag by Argyle Wood November 15, 2018