Theomione is a non-canonship in the Harry Potter fandom. It is a portmanteaux of Theodore/Hermione, pairing Theodore Nott with Hermione Granger. The fanfiction is often styled like Blaise Zabini/Hermione Granger (Blamione) fanfics with the knowledge there is available of Theodore's character.
Girl 1: I'm writing a Theomione fanfic, but I'm having trouble developing backstory for Mrs Nott.
Girl 2: Maybe you can write that she got killed because she refused to join the Death Eaters with her husband?
Girl 1: Oh! That's a good idea. Thanks.