Mastabaeating Share definition Flag The act of masturbating on bread then spreading it with a knife an eating it. What are you doing?I'm Mastabaeating.What kind of bread are you using?Wheat so it's healthy. Mastabaeating by Dandren July 21, 2010 0 0 Get merch Get the Mastabaeating mug. Buy Now — $32.95 See more merch