This is a combination of the words shit and wank. As suggested it is when a person has a wank and as they are about to cum they have a shit, this can give a mega orgasm!!!
by johnzaqxsw May 18, 2007
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"
by Jay Jay Okocha May 05, 2007