A fart released on an airplane in flight. Such flatulence is doubly rude due to the crowded confines of an airplane and well, rolling down the window just isn't an option.

The person releasing the ass gas can also be called a skystinker, although other derogatory names come to mind first.
Peeeeew! That jerk in 23-A just ripped a nasty skystinker!
by Tuftskins May 1, 2009
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