To steal, especially with a stab-like motion. It's normally a quick, smooth motion, or one unseen. It however can loosely be applied to stealing in any form.
A SHit wANK :- The combination of having a shit, and a wank at the same time. Some have argued it to be a 'SHower wANK' but this is not the case as that is an old skool shank.
Jarrell: "Yall, this party is shiit u know, fucky, I'm gonna shank on their parents bed"