2. The act of spinning and shooting crazily. You can only call it a ROFL COPTER if you get a kill by using it. If you get a head shot while using said ROFL COPTER you get l33t points.
3. The act of (R)olling (O)n (T)he floor (L)aughing.
The other day i was ROFL COPTERing and i slapped Maira in the face, it was so l33t... she cried like a little baby bitch.
When used in text-to-voice on Ventrilo server, someone spamming over and over the acronym ROFL would be heard as the sound done by an helicopter.
Lately it's been used mostly in World of Warcraft where the ventrilo system is popular.