Spaff Beast Share definition Flag A dirty man that masturbates over six times a day. A man that often needs to leave a party or social occasion so he can masturbate. Spaff Beast: I've masturbated eight times today! Friend of beast: Wow, your such a spaff beast! Spaff Beast by Slitster February 19, 2010 0 0 Get merch Get the Spaff Beast mug. Buy Now — $32.95 See more merch