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The process that an individual goes through in the moments just before passing gas. It can be as simple as a blink of an eye, to an announcement such as, "Hey everyone, check out the sound I plan to make with my asshole!"
Bill: Ugh, who farted?

Sabrina: Tim did. I know his fartual; he scratches his shoulder just before he farts.
by The Divine Clock March 29, 2014
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