gahf Share definition Flag adj.:to be ranky in a stanky way. to smell bad or just be totally lame. Guy 1-"Dude, that girl would be so hot if she wasn't so gahf!" Guy 2-"I'd do it any ways!" gahf by ethanandnatalieduo September 25, 2010 0 0 Get merch Get the gahf mug. Buy Now — $32.95 See more merch