motherfuckyer Share definition Flag A fan of CKY (the band and/or the films) who has sexual urges towards his/her mother. See also: FuCKYou, FuCKY, and MindfuCKY. motherfuckyer by EJL March 22, 2004 0 0 Get merch Get the motherfuckyer mug. Buy Now — $32.95 See more merch