Gah-Doish Share definition Flag Any type of action, swinging a bat, throwing a ball, punching some dude in his face real hard. The pitcher throws the ball, here's the swing ''GAH-DOISH!'' It's outa here! Gah-Doish by Mike Lee February 4, 2007 0 0 Get merch Get the Gah-Doish mug. Buy Now — $32.95 See more merch