fu-fu penis Share definition Flag a zombie wearing the patients outfit in the hospital in no mercy on left 4 dead with there ass hangin out tha back. "HOLY FUCK ANT RUN ITS A FU-FU PENIS".or yo D come check out this fu-fu- penis's ass. fu-fu penis by deeeeeedcell March 15, 2009 0 0 Get merch Get the fu-fu penis mug. Buy Now — $32.95 See more merch