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1.
A shady looking character usually having a dirty and dissheveled appearance. Also refers the character of the person.
"Did you see matt?... What a sketchbag!"
by Brucie and Age December 05, 2004
 
2.
1.)Somone who is dirty or iffy in some way.
2.)Somone who uses alot of drugs or alchohal.
3.)Somone who engages in sexual relations with somone much younger then they are
"That Long Haired Kid was kinda of a sketch bag."

"Jim smokes weed all the time, that kids turning into a real sketch bag."
by allthenamesaretaken!!! February 19, 2006
 
3.
a person whom gives you the feeling of rape in his eyes and usually is a creeper.
Renae- "OMG did u see him, tht sketch bag."
Courtney- "His eyes shouted RAPE!"
by ambs1029 April 10, 2009