Trans-in-law Share definition Flag When your father in law becomes your mother in law or vis-versa. Short for transsexual in law. Kenya West appears unhappy with "Caitlyn" as his trans-in-law. Trans-in-law by Oreomom July 29, 2015 0 0 Get merch Get the Trans-in-law mug. Buy Now — $32.95 See more merch
