Plummers Boob Share definition Flag Plummers boob is when a girls boobs are squeezed togther and there cleavage makes it look like a Plummers butt crack. Dang that girl has a bad case a Plummers boob. Plummers Boob by Mustache Moses November 16, 2012 0 0 Get merch Get the Plummers Boob mug. Buy Now — $32.95 See more merch