Just Wiki'ed it.
"Snaking"
The execution of several consecutive mini-turbos during races has caused minor controversy in Wi-Fi play in the form of snaking -- players who drift their karts back and forth across a straight stretch to generate repeated mini-Turbos (a movement likened to actual snakes, hence the term, "snaking"). Because this gives the user a distinct speed advantage over other, "non-snaking" opponents, snaking is regarded as anything from a legitimate, advanced racing strategy, to an unfair tactic, or even outright cheating. Some players have attempted to form leagues (or "Friends" groups) composed of avowed non-snakers, but the distinction between a "snaker" and "non-snaker" is vague, largely depending on whether the player uses Mini-Turbos on straight areas of the track or on curves.
It is unclear whether snaking is an intentional feature of the Mario Kart series game design (since this could be performed in previous Mario Kart games, albeit to a more limited extent), or if it is simply a side effect of the game's Mini-Turbo mechanics. The dispute over snaking can be compared to the wavedashing phenomenon in Super Smash Bros. Melee, or the similar snaking technique in F-Zero GX. Most if not all of the quickest Time Trial records in Mario Kart DS were accomplished using the snaking technique.