When you sleep over at a friends house and they roll out the big inflatable air mattress Aerobed and cram it into the spare room. It's 2-3 feet off the ground (you know, the really big ones) and just barely fits into the room. It looked like one of those jumpy's that kids get for birthday parties in the culdesac.
"My girlfriend and I were visiting a friend out of state, and they put us up in the spare room with the inflatable Aerobed mattress. We turned that thing into a fuckjumpy!"