Chastity flab Share definition Flag noun. A role of fat that is so large that it hangs down, covering the genitals preventing sex. They were unable to have sex because his Chastity Flab hid his cock. Chastity flab by Choadlet February 10, 2010 0 0 Get merch Get the Chastity flab mug. Buy Now — $32.95 See more merch