Iaidub, or Isaidub, seems to refer to the Tamil dubbed version of the Twilight Saga films. The term "Iaidub" or "Isaidub" is likely a misspelling or variation of the term "Isai Dub," which means "song dub" in Tamil. This refers to the process of dubbing or re-recording the audio tracks of a film in a different language, in this case, Tamil.