It's also a phrase used in the fraternity world when an active member puts his own status on the line for a rushee. He tells the house that he is "jumping the couch" for a rushee, and that the next vote to allow the rushee into the house is a simultaneous vote to keep the active in the house. Direct opposite of blackball.

To jump the couch is to go crazy for someone on national T.V. by ''jumping on thier couch'' Can be used on people you know personally too. Also see jump the shark Tom Cruise