Shwhack Attack Share definition Flag (n) A term used to describe a sudden act of masturbation, usually for men but some women do enjoy to pull it off. I don't want to do this calculus homework, I'll just pull a shwhack attack instead. Shwhack Attack by ohhhyeah. October 27, 2010 0 0 Get merch Get the Shwhack Attack mug. Buy Now — $32.95 See more merch