Not from the U.S. but am curious to know what the "UT Swap Method" is?

[TippyCanoe]

I'm not looking to find out how to actually go about the "swapping", I've just never heard of it before. I've heard of the Jap swap trick, and swap tricks for Gameshark and even Action Replay, what the hell is "UT Swap Trick"?

Thanx!