The act of flatulating upon being surprised.
Paul: Chatting with a friend about that cool restaurant you went to with the duck fat fries.

A friend: sneaks up and pokes you in the ribs.

Paul: pfffffft. Whoa! Sorry about that! It was a startlefart, you scared me with that poke to the ribs!

fartle fart shart poot phear
by ChicknWaffles October 24, 2012
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