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1.
A one-way ticket to hilarity. These differ from raffle tickets because everyone wins in the end.
Me: OMG that was hilarious!
Friend: I know, I'm buying rofltickets!
by kerbinator December 19, 2005
 
2.
When someone is seriously "bringing the lulz" and making people laugh either on purpose, or by being laughed at.
"I was laughing so hard! You should have been there. That guy was selling rofl tickets."
by Stevie Vedmore February 27, 2008