It stands for Mainstream For The Underground. The phrase was coined by James at Cyber-FM

All Artists start out as MFTU at one time or another. With a local following fan base, a spread of the word, and hard work, some get to swipe the special pen, sign a deal, and go on to play all over the world putting out albums for us all to hear!
Person 1: Do you MFTU?
Person 2: Yeah, I had playing earlier, they had a few MFTU artists playing!
by MJK94 November 8, 2012
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