To giggle so hard as to push out a fart, or to giggle at an inopportune time when a fart was already at the brink of excretion, thus expelling when giggling.

when you're hungover as shit after a spending a night drunk as a skunk

The act of farting while laughing

it’s when you giggle and fart at the same time.

When laugh so hard or so much that you fart