"Knackered" meaning tired, exhausted or broken in British and Irish slang is commonly used in Australia, Ireland, Newfoundland, New Zealand, and the United Kingdom. In southern parts of Australia if something is rendered useless or broken by an inept person it is said to be 'knackered'. "Knackers" is also a British/Australasian vulgar slang for testes, although this usage may be derived from nakers – small medieval kettle drums which were typically played in pairs suspended from a belt around the waist.