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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
 
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