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1.
When you really need to fart and it's not appropriate, you are left with no other choice but to force the gas back up into your anus/bowels.
Guy1: Dude, I really need to fart in your new car!

Guy2: You better not man.

Guy1: It's cool, I just done a Rollap. LOLZ!!!
by Dutch Oven Baker June 13, 2010