jacketbones Share definition Flag Some twink on tumblr who likes skeletons. He is fun, but also a simp. Someone: hey what are you looking at?A gay Undertale fan: Oh just this blog, Jacketbones. jacketbones by Fingersinmyazzz November 9, 2020 0 0 Get merch Get the jacketbones mug. Buy Now — $32.95 See more merch