Big Rubbery One Share definition Flag Slang. Refers to the flaccid state of the penis after experiencing something that causes one to become unaroused. "Strangers with this kind of honesty make me go a big rubbery one, if you know what I mean." Big Rubbery One by monobrau May 1, 2008 0 0 Get merch Get the Big Rubbery One mug. Buy Now — $32.95 See more merch