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English word fartknocker (referring to a contemptible person) comes from English fart and knocker. Its recorded use dates from the 1970s but it gained popularity in the 1990s, partially due to the popular influence of Beavis and Butthead
knocker (English)
(dated, slang) A person who is strikingly handsome or otherwise admirable; a stunner.. (geology) A large, boulder-shaped outcrop of bedrock in an otherwise low-lying landscape, chiefly associated with a mélange.. (particularly in Cardigan etc. in South Wales, 18th to 19th century) A dwarf, goblin, or sprite imagined to dwell in mines and to indicate the presence of ore by knocking.. [...]
fart (English)
(colloquial, usually, as "fart around") To waste time with idle and inconsequential tasks; to go about one's activities in a lackadaisical manner; to be lazy or over-relaxed in one's manner or bearing.. (informal, mildly, vulgar) To emit digestive gases from the anus; to flatulate. (colloquial, vulgar) An irritating person; a fool.. (colloquial, vulgar, potentially offensive) (usually as [...]
fartknocker (English)
A contemptible or annoying person..