British slang for masturbation, or more broadly to mean wasting time or effort on something pointless.
Emerged as British slang in the 20th century with obscure origins; possibly related to dialectal English 'wanker' meaning 'one who wastes.' The term became widely known through British comedy and media.
This word perfectly illustrates how languages have 'taboo terms' for bodily functions—every language has them, and they change constantly as society becomes more or less prudish, making slang a fascinating window into cultural attitudes.
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