The act of stabbing someone with a shank. Comes from the word shank which is a crude knife usually made in prison, a homemade knife-like weapon usually made from a spoon.
The act of sitting around (normally at work) wasting time and not doing the duties you have been assigned. also could be used as a to Sherk = to do nothing when you should be working.
Hey, you been busy today?
Dude, i was sherking big time!