To sleep at someone elses' home (esp. on the individual's couch) for an indefinite period of time. An act perpetrated mostly by college students, slackers, junkies, skaters, snowboarders, punks, ravers, clubbers, goths, hippies, cult members, or any other individual in need of a place to stay and willing to mooch said place from a friend, relative, or complete stranger willing to oblige them.
Hey man, I got kicked outta my apartment yesterday. Would you mind if I couchsurf at your crib?