In a message dated 21/01/2006 19:50:24 GMT Standard Time,
No, "pupik" does not mean "bellybutton" (aka "navel" ); it means
"gizzard", an organ found in poultry and other birds.
In Uriel Weinstein's Modern English-Yiddish Dictionary he has the same word
for gizzard and for navel, namely pupik: peh-vav-peh-yud-kof.