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A knacker is a person in the trade of rendering animals that have died on farms or are unfit for human consumption, such as horses that can no longer work. This leads to the slang expression "knackered" meaning very tired, or "ready for the knacker's yard", where old horses are slaughtered and the by-products are sent for rendering. A knacker's yard or knackery is different from a slaughterhouse, where animals are slaughtered for human consumption. In most countries Knackery premises are regulated by law.
However, in modern usage, especially in Ireland, the word has come to describe both those from lower-class backgrounds who tend to engage in anti-social behaviour, as well as those of an Irish Traveller background. In this sense, the usage of the word "knacker" is akin to the usage of the term "chav" in England and ned in Scotland. Though it should be noted that by and large, members of the travelling community in Ireland live in what would ordinarily be considered temporary accommodation; such as roadside trailers or caravans.
Use of term 
The term is in this literal sense in British English and Irish English, and gained some notoriety during the outbreak of mad cow disease (BSE) in the United Kingdom. The Slaughterhouses Act 1974, the Meat (Sterilisation and Staining) Regulations 1982, and the Food Act 1984 all define a "knacker's yard" as "any premises used in connection with the business of slaughtering, skinning or cutting up animals whose flesh is not intended for human consumption".
Knackery by-products are rendered under regulation into fats and meat and bone meal for incineration. Cattle hides may be recovered for leather production. The kinds of animal processing which can occur at knackeries are defined by law, for example, in Australia by the Commonwealth Meat Inspection Act 1983. In the EU the legislation covering knackeries is the REGULATION (EC) No 1069/2009 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 21 October 2009 laying down health rules as regards animal by-products and derived products not intended for human consumption. . The trade of collecting and rendering is by its nature unpleasant and pungent. The trade and those who practice it were considered to be repellent in many societies, resulting in a social separation. This is so not only in Ireland or Britain, but also, for example, in Japan, where it is performed by burakumin, and India, where it is performed by dalits. In the past this deterred people from entering the trade but in modern times knackeries have become profitable businesses.
The term "knacker" is used in George Orwell's book, Animal Farm (1945). Boxer, the tireless draft horse on the farm, becomes old and is no longer able to work. The farm's pseudo-socialist owners thereupon give Boxer a free trip to the animal hospital, but some of Boxer's friends (and the readers) learn that the "hospital" is really a knacker's yard. The faithful horse is not seen again.
"Knackered" meaning tired, exhausted or broken in British and Irish slang is commonly used in Australia, Ireland, Newfoundland, New Zealand, and the United Kingdom. "Knackers" is also British/Australasian slang for testes.
The term "knacker" is sometimes used in Ireland to denote an Irish Traveller. In 1960, senior politician James Dillon explained the term to the Irish parliament as denoting "the tough type of itinerant tinker". The use of the word is considered pejorative. It is now more often used to refer to people of a perceived lower class or underclass, who are not Travellers, but who have accents, attitudes and a style of dressing redolent of anti-social behaviour, petty crime, poor public housing and low educational achievement levels.
The British satirical magazine Private Eye often refers to senior police figures as "Inspector Knacker" or the police force in general as "Knacker of The Yard", a reference to Jack "Slipper of the Yard" Slipper.
- What is a Knackerman knackerman.com, undated (accessed 18 February 2007)
- "Knacker". Merriam-Webster. Retrieved 2012-07-07.
- "Knacker". Online Etymolgy Dictionary. Retrieved 2012-07-07.
- Meat Inspection Act 1983 (Cth)
- e.g. Thomas in The Virgin Soldiers
- "Dáil Éireann - Volume 183 - 29 June, 1960". Dáil Éireann. 29-06-1960. Retrieved 6 December 2011.