Yatta is a 2001 song by a Japanese comedy band called はっぱ隊 (Happa-tai; literally "Leaf Squad" in Japanese, though they called themselves "Green Leaves" in English). The song was first performed as a sketch on the Japanese sketch comedy show "笑う犬の冒険" (Warau Inu no Bōken; Adventures of a Laughing Dog), where Happa-tai, a sendup of a stereotypical boy band, is portrayed by some of Japan's most well-known comedians.

Read more about はっぱ隊 on Last.fm.