Ryan was so shitvillaged that he drank two more beers before he went to bed (even though Ronnie told him not to) and he ended up shiting all overthe bathroom of a Key West Holiday Inn.
After a weekend of drinking beer, eating all those chilli dogs, poutine, and whatever else came in contact with your lips, shitzilla is what attacks you (usually on sunday evening) when you tremble as you approach the toilet.