A fart and a laugh together.

i.e. When someone cracks a joke in the company of distinguished guests and you let go a nice unmistakable fart during your laughter.
Prince Phillip: But Your Majesty there is no shame in a laughing fart! Here, let us all, ecstatically, fart in bonne homie!
by NevermindWho March 3, 2006
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When you have built up gas that you've been trying to hold in, and something makes you laugh. This results in a vicious cycle of losing control of your bowel and anal muscles and farting up a storm from the impact of the laughter, then laughing more at the farts, causing more farts, which causes more laughs, which causes more farts, and more laughs, and more farts until there is no gas left inside of you.

Farts usually expel in rhythmic timing according to the laughs. It's like unintentionally playing an instrument.
The Laughing Farts:
Yesterday at school I was holding in a fart, and my friend passed me a note that made me giggle, and I lost control for a second and blew a huge one. So then I started laughing even more and I farted even more and I had to run to the bathroom laughing and farting and the whole school was watching me. Traumatizing.
by Tatertawt24 August 22, 2012
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When you have to fart inpublic, but
you don't want to be embarrassed then
someone does something so hilarious
or extremely funny, you fart during the laugh.

THEN ALL LAUGHTER STOPS AND PEOPLE LOOK AT YOU.
AND SMELL THE ODORIZED AIR.
John: OMGZ That was so funny I took a laugh fart!

Becky: LAWLZZZZZ!!!!!!!! *farts*. woops..
by jdouglas8 May 12, 2008
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Fart laugh: is a destintive laugh that each person has that is different to the common laugh that is used everyday comical or funny situations.
Blain mentioned to tahlia that isaac’s laughter after he relieved gas in a group was different. Blain told tahlia that it’s a “fart laugh” caused by embarrassment of the unholy stench that whiffed past unexpecting inhaling nasal passages.

Eg. Isaac that’s rank! We know it was you because you fart laughed
by BlaintrainedYasillygoose December 30, 2019
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