Nitro Microphone Underground was a Japanese hip hop group. The group appeared on the club scene in the late 1990s with members Dabo, Macka-chin, Deli, Suiken, Gore-Tex, S-Word, XBS, and Bigzam. Although Gore-Tex appears on many songs on the Nitro Microphone album, he is credited under different names, including the More-Sex alias. The name of the band is said to have been suggested by Macka-chin.
They have done collaborations with Shakkazombie and about half of DJ Muro's work. Most of them have done some solo work, especially Suiken and Dabo. They released their self-titled first album as an indie release in 1999, soon selling out of the 20,000 copies. They were picked up by Def Jam Japan and the album was re-released in 2000 making it to number 12 on the Japanese charts.