Then again, there probably isn't. I have yet to play the game, but many people have said it is not in the game. Mario Kart 7 reportedly uses the steering controls similar to what is in Mario Kart Wii. So any short-angle turboing is impossible, which was the key to getting repeated turbos in Mario Kart Double Dash and Mario Kart DS.
However, one of the videos on the official Mario Kart 7 site shows something akin to repeated turboing (by the way, the official term is straight-stretch mini turboing).
Go to the items page on the Mario Kart 7 site, and click on the Blue Shell (spiny shell) link. Yoshi in the video appears to be snaking, but it's too tough to tell because of the camera angle.
Again, I'm more likely to put money down that there is no snaking in the game, so don't count on it when the game is released in a few days.
