Roflcopters comes from the reference to the acronym ROFL (Roll On The Floor Laughing) and Helicopters.
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.
-I told him there was an Epic drop down the cliff ... and he jumped"
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