Tiff Needell a.k.a Twathead is a new hostile/side character in Fallout Eleventy.
His attacks are knocking you out with his smugness gun. After you come around, he injects you with something, sedating you, so you are awake but unable to resist him. He then sits you in a chair and begins to shows you tv footage of his career and also talks about his racing career which will eventually bore you to death or convert you into a smug-ler.
He wears a fire proof suit which repels all insults that people throw at him and it turns it into ammo for his smugness gun. The only way to kill him is to continually agree with him, causing a time paradox and killing him.