Refers to where someone noisily pretends to regret an action --- such as turning off a light, splashing water, etc. --- which caused someone else momentary shock and/or outrage, when in reality said prankster was completely intentional in performing said minor atrocity, and has gotten a huge giggle out of the hilarious-to-him distressed reaction of his "victim"!

Dude #1: flips the ceiling-light off in an otherwise-darkened garage where he is fully aware that his buddy is working
Dude #2: indignantly: Yo!!
Dude #1 in a classic "apologetic guffaw" tone "Huh-hoh --- saww-rreee" gives a big grin as he flips the switch back on again.

apologetic guffaw by QuacksO December 5, 2020

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Guffauto

“Self laugh” (Latin). Reacting to one’s own comment or post with a “haha” or smile emoji indicating recognition of humor. The Joker (character from the Batman universe) is well known for using frequent verbal guffauto by maniacally laughing after making an ominous or threatening statement.

Dude, that joke was so lame I can’t believe you gave it a guffauto!

Guffauto by Squidulus tents March 12, 2022

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Guffart

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."

Guffart by Doc Daredevil Dagwood Dipthong January 6, 2007

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