One who sits on their couch (or any couch), and scopes for attractive people or celebrities on TV or in movies.
"The only reason she watches House is because she thinks Hugh Laurie is attractive."
"What a couch whore."
A person who takes up 1/4 + of the couch when there are many people on the couch; Hogging the couch
Jenny is being such a couch whore tonight.