I'm Really Worried I Have Upset My...
Family & Relationships0 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.There is little doubt how 'dipstick' came to have a crude meaning, apart from the rhyming element. (I need to be circumspect here, I suppose.) You need think only of the function of that device in a car's engine to see what anatomical part it is a synonym for and most nicknames for that are also used to mean 'idiot'.