Whackbam or Bonkle (ぽかすか Boka suka) is a technique used by Charlotte in Trials of Mana. She learns this tech by default in her starting Cleric class. This tech allows Charlotte to club all foes present within a small radius in front of her for mediocre amounts of damage when one segment of her Class Strike meter is full.
Charlotte will start off by swinging her flail above her head. She then swiftly follows up by thrusting the flail onto the ground and swiping it in a horizontal direction in front of her body.