Derived from "shit eating grin" + "sherlock holmes".
A smile one gives to another person when knowing
something that other person might wish to know, but doesn'
t.
A smug, slightly ugly smile usually given by a wanker, backstabber, or
biatch. The person smiling may even look as if they wish to say, "It's no shit, Sherlock...that you're going down."
Lily: "Uh oh, Kayla.... Did you see
Missy's shitlock smile? You'd better watch your back."
Kayla: "
Well naturally the
brown stuff has to run off the nose down to the mouth...."