A miserable old cunt that you just want to repeatedly punch in the face. Typically over the age of 40, wears thick glasses and constantly looks annoyed for no good reason other than she's an old bitch.
Don't look at me again or I'll slit your fucking throat you crud munching bitch!
(Thanks to Matt for Crud Munching Bitch. He said it first whilst in the midst of a real crud muncher who was also a bitch!)