Top Definition
A fart that creeps upward and becomes trapped in your shirt, warming you at the same time. Later, when you take the shirt off, you get a whiff of the remnants of the fart, like you farted again.
On a chilly winter day, a fartigan sweater is kinda nice, until you take off your shirt later on.
by stormteam69 April 11, 2010

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