Someone who is lame, uncool, tired, or just generally boring.
Other forms of the term -
"Couch Collecting" - The act of being boring/lame
"Couch Collection" - A group or series of things that are boring.
Lyda: I broke up with my boyfriend because he was too boring.
Bryant: Yeah, he was a total couch collector.
Will: This party is lame.
Pete: Yeah, these people are couch collecting.
James: What did you do last night?
Rodney: Well I felt sick so I just stayed at home and collected couches.
Hank: I can't believe the professor expects us to read all these crappy books.
Karen: Yeah, this is a total couch collection.