This generally happens when someone has been working out or stressing their torso and then a little poot comes out with an amazingly awful stench.
Holy crap, Lucas was exercizing and then he smelled horrible i think it was an air fart.
by AustinFera December 30, 2005
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A release of a fart outdoors that is so dense and vile that not even a breeze, strong wind, or any other weather related condition can safely disperse the heinous ass gas before it makes its way to all surrounding victims’ noses. Even moments later, this thick and gaseous hell-beast of a rectal belch will stay lingering in the same outdoor vicinity in which it was spawned.
The family cookout was going well this past weekend, until Bobbo laid an open air fart that cleared the entire picnic area and almost killed his already unhealthy, jaundice looking friend, Smear.

Minutes later when EMTs arrived to collect Smear, the lingering aroma of Bobbo’s open air fart forced them to wear decontamination suits and oxygen masks in order to enter the hot zone.
by Mr Damien Bean May 20, 2015
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If you stand on your head and fart, the air comes out cold.
Charles: My word, William, it is absolutely sweltering today.

William: Indeed. Say old boy, why don't I stand on my head and bring the temperature down a couple of degrees with a cold air fart?

Charles: That's the ticket!
by Walter Henry VIII February 14, 2011
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