(1)A
person or
situation that seems a little off, could possibly lead to
trouble. (2) Just being said to piss someone off by calling them a sketch and having everyone else do the same until they flip the fuck out.
(1) Whoa dude this deal is kinda sketch maan.
(2) Kevin: Hey Chris why you being sketch?
Charles: Ya you fucking sketch
Tim,
Lance,
Eric, and
Rick: SKETCH!!!
Chris: FUCK YOU GUYS IM NOT SKETCH YOUR SKETCH!!!
Kevin: (Whispers) ya ok sketch