RORY: Ish Kabibble.
Ish Kabibble, born Merwyn Bogue (1908-1994), comedian and cornet player. He appeared in ten films between 1939 and 1950, and although his stage persona was a gangly goofball, he was also a notable cornet player. He performed with bandleader Kay Kyser, and was the manager for the Kay Kyser Orchestra. After the band broke up in 1950, he worked as a solo act until 1961, when he became a real estate agent. He has become an icon of American comedy, often referenced in popular culture.
His stage name came from the lyrics to one of his comic songs, “Isch ga-bibble.” It’s a mock-Yiddish expression, supposedly meaning, “I should worry?”. In fact, it isn’t Yiddish at all, although there’s a Yiddish phrase nisht gefidlt meaning “it doesn’t matter to me,” from which the term “isch ga-bibble” may have been derived.
I’m not sure if Rory is simply answering one name from Jewish culture with another, or if she is literally saying, “I’m not worried”, or “It doesn’t matter right now”.
The Annotated Gilmore Girls 