The Twist Dunk is Waluigi's Special Shot in Mario Hoops 3-on-3. To perform it, the player must tap out the letter W twice. The W stands for Waluigi.
When initiating the move, Waluigi would dribble the ball in a W shape, then a "Γ" symbol would appear. He would then shoot the ball toward the basket, a cyclone trailing behind it. Waluigi swims through the air and dunks it in.
The visuals are the same when shot outside the 3-point line, but as usual, a teammate needs to jump, catch the ball, and finish the dunk.