From the Super Mario Wiki
Wild Move is a special technique that all playable characters can make in Donkey Kong Barrel Blast. In order to gain a Wild Move, the Kong or Kremling has to collect 50 bananas. Once part of their gauge is full, the player should hold the control stick until their character blinks, and then quickly let go. This will make the character use a Wild Move, making them much faster. The Wild Move can last as long as the character hits several barrels, rivals, or enemies. Hitting a Steel Barrel or being hit by an item will stop the Wild Move.
Candy Challenges involving Wild Moves: