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1.
A series of massively shitty events where everybody involved has their world rocked to the very core by the shear shittiness. A shitstorm so large, so shitty, that the very ground beneath the shitees begins to shake with shittiness.
Mr Lahey - "Do ya know what happens when 2 shitplates come together, under extreme pressure Bubbles? ...Shitquake..."
by Peter Anthony Johsnon July 20, 2006
 
2.
a very violent expulsion of fecal material.
none is necessary...what can i say?
by Mythical Beast February 17, 2005