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To be so excited about something you almost shoot the gayest thing in the world out of your butt. Similar to pooping kittens.
I saw the cutest little puppy earlier and it made me shoot off several rainbow farts.
by plaidtattoo February 10, 2009
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Rainbow Farts happen when you end up eating too much colorful food like skittles and M&Ms to the point where you shit out farts that are rainbows.
*Jacob munches on some M&Ms*
Jacob: *FARTS*
Jacob: OMG OMG OMG I JUST HAD A RAINBOW FART
by Khagreytits September 07, 2014
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