Definition from Wiktionary, the free dictionary
ROFL is Roll on Floor Laughing(see ROLF)
Roflcopter is referred to as a laughing "copter".
Roflcopter could also be used to express a "pwning" of someone
Example: I flew my roflcopter all over him.
TheKnightlyOne 01:46, 24 February 2009 (UTC)