mirthquake 

an episode of laughter that entails shaking or violent motion.

"You should prepare yourselves for a mirthquake, as today's comic strip was rated 7.1 on the rictus scale." - penny-arcade.com

mirthquake by C Vogue November 13, 2006

mirthquake 

A violent shuddering of joy, an overwhelming tectonic transposing of ecstasy

Standing in line to recieve the Wii, I had a minor mirthquake.

mirthquake by Hecuter November 14, 2006

mirthquake 

A quake of jolly laughter that shakes you from your feet to your fat, fat jowls.

Jerry's mirthquake pleased him.

mirthquake by withoutamartyr November 14, 2006

mirthquake 

(n) A powerful feeling of happiness
- PA made me do it

I would've had a mirthquake at my believed invention of the word, if it weren't proven practically ubiquitous by google!

mirthquake by Da_Jesus November 14, 2006

mirthquake 

A joyous dance performed by many, significantly overweight people.

Dude, Rosie O'Donnell looked so great doing the booty-pop that she caused a mirthquake!

mirthquake by Giblo November 15, 2006

Mirthquake 

caused by the person who is the center of a wave of happiness of other people. This happiness is transferred from person to person by word of mouth whether it is a joke or funny event.Those people tell their friends who tell their friends.

Jimmy caused a mirthquake the other day at lunch when he bumped into and knocked off the principle's hair piece in front of hundreds of students.

Mirthquake by CHStom December 12, 2007

Birthquake 

When a female in labor makes the final push to get the baby out, but lays a fart so long and loud it measures on the Richter scale.

Jesus, while Melissa was in labor with our son Jake and she made the final push to get him out, she dropped the loudest fart that had to measure on the Richter scale. It may have been the first ever Birthquake!

Birthquake by Tee Cee Deez February 29, 2020