Definitions by Kevin O'.

USK

An online, most commonly and instant messanging abreveation for "You Suck" Other closely related words are isk

I can't believe you ditched me at lunch today Robzor, usk!!!

USK by Kevin O'. March 27, 2005

isk 

An online slang term commonly found in instant messaging meaning "I Suck" but not in an orally sexual manner in a screw up kind of way. It is common among American High Schoolers in NYC.

I screwed up that god dam math test on geometric proof so mother f'ing bad, isk so freakin bad Rob.

isk by Kevin O'. March 27, 2005