STOPzilla was a computer program that the user would install on his Windows PC. It acted as if it detected or removed spyware, while all it did was being spyware itself, opening unwanted pop up windows, slowing down the system and so on. It was impossible to get rid of and cost a lot of money.
She lifted her skirt and said "get out of my house you perv" - WTF? She's such a Stopzilla. After I was gone, she called me a million times.
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"