Rolling on the floor, laughing my fucking ass off, and scared the dog
Usually found in Instant Messages, typed when someone has said something REALLY funny, like, "Why won't my new home-built PC start up? Should I have used those little brass stand-offs between the case and the motherboard?" The proper reply to such stupidity would be ROTFLMFAOASTD!
by Da Dirty Q-Tip October 18, 2002
Commonly spewed by AOL'ers after another AOL'er says something even too stupid for the average AOL'er.
AOL'er 1: I LOVE ZSNES!!!!111111111
AOL'er 2: ROTFLMFAOASTD!!!!!!!!111111111111111111
by Parasyte January 28, 2003

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