Cup Brownie Share definition Flag Cup Brownie: To put feces in ones hand and push the hand into another person face and laugh. "Hey Fred, did you Cup Brownie John the other day" "I certainly did Cup Brownie John" Cup Brownie by Cup Brownie King November 4, 2013 0 0 Get merch Get the Cup Brownie mug. Buy Now — $32.95 See more merch