Also can be referred to as a really ugly girl that is used for sex. She would be a cum sock. Throw it in the washer/out-of-your-apartment when you're done & never talk to it/her until next week when you are horny again.
Mark: "Nice, sounds like a long day at the office".
Jeff: "Dude that girl was so ugly, how horny were you to have to bang her"?
Jared: "I was so horny, it was either her or a cum sock!!"