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.
"Oh
man, Shitzilla's on the prowl, can you hear him growling?"
"*Whew* Shitzilla really took a
round out of me that
time"