Reversible Yam Share definition Flag (n.) The external genitalia of a woman; the vulva. "Look at the camel-toe of Glennis! I betcha her reversible yam is in need of a good noshing!" Reversible Yam by Blenderhead91 March 31, 2009 0 0 Get merch Get the Reversible Yam mug. Buy Now — $32.95 See more merch