The act of shitting yourself while laughing at something. This happens because you were laughing so hard, your anus laughed with you.
Friend 1: 'My little sister told me the Justin Bieber movie was the best experience of her life and started to cry'
Friend 2: 'What did you say?'
Friend 1: 'I started laughing uncontrollably, but then I had a Sphincter Giggle and ran to the bathroom to clean up'
Friend 2: 'OMG I think I just had one too!'
Friend 2: 'What did you say?'
Friend 1: 'I started laughing uncontrollably, but then I had a Sphincter Giggle and ran to the bathroom to clean up'
Friend 2: 'OMG I think I just had one too!'
by thatguywhosaysstuffsometimes February 28, 2011

"Last night on call you had some of the midnight giggles."
"Congrats you have performed the midnight Giggles."
"Congrats you have performed the midnight Giggles."
by TallTart May 31, 2023

by Wayne M. June 6, 2018

The action of stuffing peach cobbler into you urethra and they having a 3 hour jerk circle with your mate in which the end product of peach cobbler semen is preserved eaten to be eaten on thanksgiving while listening to the Georgian news and giggling at how absurd this definition is.
by Super Nyquil December 26, 2024

by aphexfinn January 8, 2022

A 4 millimeter tiny bug that's green and has yellow polka dots on it. Giggle Bug is often considered as either a cult name or a random thing.
Person 1: Giggle Bug is a cult!
Person 2: Giggle Bug is coming for you.
Person 1: ...what??
Person 2: Giggle Bug is coming for you.
Person 2: Giggle Bug is coming for you.
Person 1: ...what??
Person 2: Giggle Bug is coming for you.
by EllieIsEpic8728723 January 28, 2025

by niggathatlovespink April 2, 2022
