Only a Twazzock would ask, "What's a Wazzock?"
Er, um, actually... I didn't know either...
Apparently Brit-slang for idiot/moron = Wazzock
I think it has something to do with the name for a worm or something or other...
I guess for extra emphasis you can also be a Twat+Wazzock = Twazzock
Ahhh, the fascinating things I learn on the boards...