text: Asking 'Who's the Daddy?' is like asking who is c0ck of the walk, or who runs this place.\n\nIt is old UK prison slang. The Daddy was the guy who controls everything, a piss take on Mafia Godfather probably.\n\nIt came to public prominence in the C4 film 'Scum', about life in a Borstal School (Young Offenders Institute, these days).\n\nActor Ray Winstone was so chilling in this that 'Ooos the Daddy?' is almost his catchphrase.