What is Roflmonster?
1.
the beast within you that makes you laugh at completely inappropriate times, like a funeral, a breakup, when someone tells you of an ailment, or a dramatic movie that matters to the person you're watching it with
i was at my girlfriend's grandpa's funeral, and my roflmonster came out at the worst time possible!! i couldn't control it at all, but i didn't care for some reason
See
2.
jim: wanna hear a joke, bob?
bob: sure, jim.
jim: two peanuts were walking down the street.
bob: k..
jim: ..one was "assaulted"..
bob: ROFL! LOL! LMAO! ROTFLMAO!!! BAHAHA!
jim: dude you're such a roflmonster..
See