porridge

Concise Oxford English Dictionary © 2008 Oxford University Press:
porridge/ˈpɒrɪʤ/

▶noun

• 1 chiefly Brit. a dish consisting of oatmeal or another cereal boiled with water or milk.

• 2 Brit. informal time spent in prison.

– derivatives
porridgy adjective.

– origin C16 (denoting soup thickened with barley): alt. of pottage.