"Press the button again while the Ki wave is connecting to do additional damage. You'll need Ki for the extra attack."
Video game appearances
Burst Kamehameha was named in Dragon Ball: Zenkai Battle Royale, where it appears as a technique of Super Saiyan God SS Goku. This version is powered up by timing button presses every time Goku chants a syllable in the word "Kamehameha".
In Dragon Ball: Xenoverse, it appears as part of the Super Saiyan Blue Goku's Super Skills. In the game, the user can fire an additional larger blast if the button is pressed after the initial Kamehameha wave hits the opponent, however ki is required in order to fire the additional blast. It can also be obtained by the Future Warrior as a reward in Resurrection ‘F’ Pack DLC Parallel Quest Event: "Room to Spare".
In Dragon Ball Xenoverse 2, it returns as one of Super Saiyan Blue Goku's Super Skills in his Whis Symbol Gi 1 skillset. It can also be obtained by the Future Warrior (Xenoverse 2) as a reward in Parallel Quest 72: "First Training".