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ONAD→taint (2)

taint (2)

Flag: gbEnglishOxford New American Dictionary
taint2 /tānt, teɪnt /
▸ noun US vulgar slang the perineum.
– ORIGIN 1950s : from the contraction of it ain't in humorous phrases referring to the perineum’s position on the body, characterized as being neither the anus nor the genitals.