OCTO-MAC Share definition Flag A quadruple Big Mac with eight all-beef patties. Invented on the BEST DAMN PODCAST EVER to combat the Japanese Mega Mac, a four patty version. "Nothing says America like an OCTO-MAC in your face." OCTO-MAC by Funx February 27, 2008 0 0 Get merch Get the OCTO-MAC mug. Buy Now — $32.95 See more merch