To act, do, or say something suspect or shady that others find negative or wrong.
Example #1
Friend #1 : Yo dood, last night I was bored so I went and slept with my ex girlfriend...
Friend #2 : DOOD, THATS SOOO
SUS!
Example #2
Friend #1 : Yo! look at that kidd wearing a twilight shirt!
Friend #2 : HAHAHA DUDE that kidd is so
sus!
Friend #1 : I know! :D
