DK Bongos are bongo-like controllers for the Nintendo GameCube video game series Donkey Konga, Donkey Konga 2, Donkey Konga 3, and Donkey Kong: Jungle Beat. There are two bongos, each shaped like a classic Donkey Kong barrel with a rubber drumskin fastened on top. It also has a built-in microphone to detect clapping. In Japan the controller is called the "TaruKonga" (or "TaruConga") controller. The name is a multilayered pun, combining "Taru" (the Japanese word for "barrel"), "Kon", or "Con" (a suffix used by Namco when naming their original peripherals, such as the "GunCon", or the "TaTaCon"), and Konga (or Conga).
The DK Bongos are featured in Super Smash Bros. Brawl as Donkey Kong's Final Smash attack, the "Konga Beat".
The game Donkey Kong Barrel Blast was originally designed as a GameCube title to be used with the DK Bongos. Eventually the game was moved to Wii, and bongo support was scrapped in favor of the Wii's built-in motion controls. The WiiWare title Plättchen Twist 'n' Paint was also going to support the peripheral. However, N-Europe revealed Nintendo wanted DK Bongo functionality removed to avoid alienating users who do not have them.
Source: Wikipedia, "DK Bongos," available under the CC-BY-SA License.