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Related to turtleneck: Turtleneck sweater
slang The foreskin of the penis. An allusion to a type of sweater with a high, tubular, close-fitting collar. At first I assumed we'd get our son circumcised, but the doctors said there was no reason to get rid of his little turtleneck.
n. the penile foreskin. (A play on the type of collar.) He’s talking to the doctor about getting rid of his little turtle-neck.