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