mack feldman Share definition Flag someone who hooks up with a guy, and then the guy realizes he is gay. he's like WADDUP after hooking up with a mack feldman, and then goes and hooks up with a ryan zeisloft. mack feldman by COD DA MASTA January 14, 2009 0 0 Get merch Get the mack feldman mug. Buy Now — $32.95 See more merch