Derived from Hetty Wainthropp, a retired working-class woman who has a knack for jumping to conclusions. A 'Hetty' is finding an obscure, tentative and often completely ridiculous reasoning to an event that has taken place.
Jimmy: Oh no! The whole computer network has gone down and I was on for a high score in bubbles. How has this happened??
Caz: Well I saw Tommy eating a sandwich earlier which we all know he never normally does, he's a wheat crunchies man. He must be responsible for this.
Claus: Oh hello, Caz is doing a Hetty again! The hoe...