"Piggate" refers to a claim that, during his university years, the former British prime minister David Cameron inserted his penis and/or scrotum into a dead pig's mouth as part of an initiation ceremony for the Piers Gaveston Society at Oxford University.

The Piers Gaveston Society, or Piers Gav for short, is a dining club founded in 1977 at the University of Oxford. It is named in honour of Piers Gaveston, favourite of King Edward II of England. In recent years, parties run by the society have been the focus of increased tabloid news coverage revolving around lurid allegations of debauched behaviour, such as Piggate.