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1.
A period of time,in which the earth goes QUACKKKKKKKKKKKKKKKK
Earth:-rumble-
Person 1:What was that!?!?!
Person 2:it's a earthquack-
Earth:QUACKKKKKKKKK
by Fanasyz June 14, 2010
 
2.
The Anti Ginger Crew
When a duck's quack has such a loud echo that is causes an Earthquake
( which it does it just sounds the sme as the orignal and cant normally be heard)
Duck - "QUACK"
Farmer - "EARTHQUACK!!!!"
by WeeStev0 January 15, 2009
 
3.
Definition to be still unknown believed to be a legendary pokemon that can shake the earth with only its cries.
Psyduck at powerlevel 999999 of supersaiyan crying Earthquack
by DuckTrainer July 01, 2013
 
4.
Scientifically questionable medical practitioners who claim to be able to heal earthquake victims with special touching, unproven medicines, etc.
Church of Scientology "volunteer ministers" who claim to be able to heal nervous systems of Haitian earthquake victims by touching them are earthquacks.
by Coyoty January 24, 2010