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.