howdafy Share definition Flag Used to greet, invite, or welcome someone. Stands for "How the F*** is your day?"; used to replace howdy Man1: Howdafy? man2: Howdafy. 1: nice day? 2 Fo sho howdafy by JLeerz April 14, 2008 0 0 Get merch Get the howdafy mug. Buy Now — $32.95 See more merch