scooby

British Cockney rhyming slang for "clue," shortened from "Scooby Doo." Almost always used in the negative — "I haven’t got a scooby" — to mean you have no idea what someone is talking about or how to do something. The phrasing is casual and pubby, common across the UK and Ireland in everyday speech, comedy, and football podcasts. Outside Britain it can sound dated or twee, but in its home territory it remains a perfectly natural way to admit cluelessness.