When a fraternity member ejaculates on the back of a sorority member. Only when he finds her to be passed out after a party.
1. (Male) Dude, that bitch was so drunk last night she passed out before we could fuck. I had to give her a Cullowhee Back Stabber.
2. (Female) I got so hella wasted last night, I woke up with a Cullowhee Back Stabber.