SOOKIE (to one of Luke’s customers): OK, I added a little fresh lemon and a little cayenne pepper. You’re gonna plotz!
Plotz is Yiddish slang meaning to be overcome with emotion: the word literally means “to burst”. Sookie’s use of the slang doesn’t seem to mean she is Jewish, any more than Lorelai’s use of Catholic slang makes her Catholic.
The Annotated Gilmore Girls 