To totally destroy an opponent who had no chance of winning. This is most used in PVP video games and usually pertains to a situation where through either numbers, gear or some other quantifiable aspect of the game the outcome was a foregone conclusion. Derives from the internet acronym ROFL to illustrate that the victor is "rolling on the floor laughing" while defeating his or her opponent.

A saying used by really 1337 gamers. When someone gets rofflestomped, you know they got pwnt pretty hard, AND it was funny. Used in Counter-Strike frequently.