Bag Whacker Share definition Flag A male who frequently masturbates Can be used as an offensive term - "George Bush is a Bag Whacker" "That bloke's a bag whacker" "He can't get a girl so he just whacks his bag all day long" Bag Whacker by david81 July 22, 2008 0 0 Get merch Get the Bag Whacker mug. Buy Now — $32.95 See more merch