Manubaday Share definition Flag mʌnu:bədeĭ.The day before yesterday (two days ago). Person 1: When did you go to that Bob Dylan show? Person 2: Manubaday, it was great! Manubaday by fizzeh April 29, 2010 0 0 Get merch Get the Manubaday mug. Buy Now — $32.95 See more merch