mubblies Share definition Flag Man boobs, Man tits, Mitts, Moobs, generally fat that has accumulated in a male's chest area forming breasts. Comes from the word Jubblies, meaning large breasts. Look at the Mubblies on that guy! mubblies by dazza12 October 5, 2010 0 0 Get merch Get the mubblies mug. Buy Now — $32.95 See more merch