A Wiggler is an enemy in the Mario series of games. It is a yellow caterpillar that was introduced in Super Mario World, and was later introduced in the Mario Kart series in Mario Kart: Double Dash!!.
In Mario Kart
The likeness of Wiggler makes its first Mario Kart appearance in Mario Kart: Double Dash!!. Borrowing its green color from Super Mario Sunshine, long Wiggler-like buses appeared as part of the traffic in Mushroom Bridge and Mushroom City. Unlike the cars and trucks, which simply made racers spin out, Wiggler Buses flipped racers over. They are also immune to all items and attacks; if a player with a Starman hits a Wiggler, they will simply bounce back.
In Mario Kart DS, Wiggler is the final boss on Level 7 in Mission Mode. A racer must beat Wiggler in a race on Mushroom Bridge by collecting Starmen and staying at the fastest rate possible. Wiggler gets faster after each lap has passed and on the last lap Wiggler gets angry.
In Mario Kart Wii, two Wigglers appear in Maple Treeway. Bumping into them pushes racers back. A competition on Wario's Gold Mine took place with a Wiggler. Players had to race it and like Mario Kart DS, Wiggler gets angry on the last lap.