A female (or male, implying female attributes) who is a two faced bitch. She is lying and deceiving and most likely has many annoying qualities, especially a voice.
A vicious, contentious, two-faced old whore that strikes out, and devises evil for people she is in contact with for the simple reason that her life is so depraved and deprived and because she needs some dick in her cunt really bad.
The definition of a cunt sack is a person or object that resembles or acts like someone's testicles or just acting like a complete cunt as well as a sack of testicles. This can be used as a description of a man's masculinity or as a woman's fact of being a fucking whore. Or just your dumbass friend.
Sally: Gee, Matt is sure being a Cunt Sack today, I wish i could get rid of him.
Ginnie: Yeah, he seems like a complete dick.
Matt: You are a fucking Cunt Sack , I'm right fucking here.