Adding Spice to the Porridge11‘Porridge’ is British slang for a prison sentence. E.g. ‘Doing his porridge’. The term is most commonly thought to be an allusion to the fact that porridge is, or used to be, a common food in prison. The term is also thought to be a pun on the much older slang word for prison, ‘stir’.: The development of a synthetic cannabinoid market in an English prison