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1.
Something so amusing, or indeed so ROFL, it causes one to spin.

Napalm in the morning makes me rofflcopter
by Summerhayes March 27, 2008
 
2.
1. The vehicle in which you find yourself when you ROFL.

2. A state of mind that you obtain when you ROFL.

3. The funniest thing John's ever heard.
Guy #1: "So today I was just standing there and then BAM! I crapped my pants!"

Guy #2: "Rofflcopter!"
by Geoff: The Beast April 03, 2008