Couch Muffin

The really ugly and/or fat girl that hangs out with the very attractive girls. The attractive girls will still say that the unattractive girl is "cute". The couch muffin will go EVERYWHERE with the attractive ones.

"Dude, the chick Charlotte tried to hook me up with is a total couch muffin!"
"Man that sucks! Why does Charlotte have such an unattractive friend, when all the others are amazingly attractive?"