Fag-wah Share definition Flag Fag-wah is a sauce or topping typically added to steaks in foofie steakhouses. It also means "shit" in french. The Fag-wah on Tom's steak tastes like fag-wah. Fag-wah by fasdgrgfg34223 July 31, 2012 Get the Fag-wah mug.