פּופּיק, ־עס/…פּקעס
דער
'navel, bellybutton'

ETYMOLOGY

Beider suggests the word is from Czech pupek, but it seems more likely to be East Slavic (e.g., from Belarusian пупо́к). The /i/ in Central Yiddish means the word is probably old.
Czech pupek; Ukrainian пупка, пупо́к; Belarusian пупо́к ; cf. Polish pępek (see פּעמפּיק).
{Beider 2015: 430; Derksen 2008: 417}
The idiom דער פּופּיק פֿון דער וועלט 'the navel of the world (i.e., important - ironically)' may be a calque of Polish pępek świata.

WESTERN

Oyberland (West Transcarpathian)

pɩ́pɩk {זי} {WTCP, Berettyó-Újfalu, 47212}

CENTRAL

Unterland (East Transcarpathian)

pupək 'gizzard' (from Hungarian pupák) {ETCP, U. Weinreich 1964: 261}

pipɩkʲ {הינער־מאָגן} {ETCP, Teiuș, 46233}

pɩpɩkʲ {ETCP, Bistriţa, 47241}

pɪ́pɪkʲ {בײַ אַ הון} {ETCP, Mukachevo, 48226}
- púpɪkʲ {זי : בײַ קליינע קינדער אויך {i.e., informant's wife}}

dɛ pɩpɩkʲ {ETCP, Nyzhnya Apsha, 48233}

pᵻpikʲ {אַ ייִד אַ פּ' — אַ קמצן} {POLAND, Wolbrom, 50196}

pɩpɩk {POLAND, Warsaw, 52211}

SOUTHEASTERN

pɩpɩkʲ {ROMANIA, Brăila, 45273}