Russian for "bellybutton," the technical medical term for which is "navel." Shows up occasionally in English, probably due to the related German word pupik being carried here by Yiddish-speaking Jewish immigrants. This can be seen in a Yiddish expression meaning "good health" or "bless you" (in the after-sneezing sense): "ein gezund in der pupik," or "good health down to your bellybutton."

Pupok is also a Russian male given name.

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