When playing a video game, the act of defeating another player so bad, it's down right humiliating. You have no other choice than to rofl at the fact that you stomped his ass.
Dude, did you see that rogue try to gank me while I was eating my sandwich? I trinketed that shit and 2 hit him. Bitch got roflstomped.
To dominate someone to the point of embarrassment and shame, usually in a videogame. Derived from the popular acronym ROFL meaning extreme laughter and Stomp meaning an epic asswhupping.
"Dude, Evan totally just totally ROFLstomped that poor kid at Guitar Hero"
"Did those n00bs really just challenge us? They're in for the ROFLstomping of a liftime!"