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The act of laughing so hard that muscle control is temporary relaxed, resulting in the droppage of ass.

From colloquial "Guffaw" and "Fart."

Similar words include: Shart, Snart
"Wow, that was a great burrito. Whoa, did that fellow just slip on a banana peel? How funny! Oh my god I think i just guffarted."
by Doc Daredevil Dagwood Dipthong January 05, 2007
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