Any and all puns replacing the two letters "we" or "re" with "Wii" when referring to Nintendo's console. Special nomination to the Sony fanboy's favorite term: "Wiitarded"
Also, since there was a cartoon about this one, any jokes about "Wii" centering about the penis.
To start things off, a seasonal joke
"Where my Peeps at?"
"Peeps", of course, referring to the delicious sugar-encrusted, vaguely bird-shaped marshmellows we stick in the microwave every Easter. I've heard this about several dozen times in the last week, and I hear it every damn year, which I think fully qualifies it for the TJA.