A.J. Mclean Share definition Flag a member of the musical group The Backstreet Boys. Possibly the hottest guy that ever walked. Others should worship at his alter. A.j. Mclean is sexy. A.J. Mclean by Wut_You_Lokin_At May 31, 2005 0 0 Get merch Get the A.J. Mclean mug. Buy Now — $32.95 See more merch