look up any word, like the eiffel tower:
 
3.
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.
by CHStom November 15, 2007
 
1.
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
by C Vogue November 13, 2006
 
2.
A violent shuddering of joy, an overwhelming tectonic transposing of ecstasy
Standing in line to recieve the Wii, I had a minor mirthquake.
by Hecuter November 13, 2006
 
4.
A quake of jolly laughter that shakes you from your feet to your fat, fat jowls.
Jerry's mirthquake pleased him.
by withoutamartyr November 13, 2006
 
5.
(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!
by Da_Jesus November 13, 2006
 
6.
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!
by Giblo November 15, 2006