Mafumafu Share definition Flag Japanese Vocaloid producer turned singer-songwriter. Became popular due to his impressive vocal range and the ability to sing in a high, feminine voice. Vocal equivalent of a trap. "Mafumafu's voice is great. I bet she's super cute.""That's a guy..." Mafumafu by Blue9377 October 28, 2018 0 0 Get merch Get the Mafumafu mug. Buy Now — $32.95 See more merch