STUDENT: Okay. So I’ll see you in class. And maybe at that Phi Kap party tonight?
LORELAI: Ginchy!
STUDENT: Cool. Bye.
Ginchy is dated teen slang meaning “cool, neat, sexy”. The word was popularised by “Kookie” Kookson, played by Edd Byrnes, in the hit private detective television series 77 Sunset Strip, which aired from 1958 to 1964. Kookie, who was a wisecracking, hair-combing hipster and assistant to the detectives, is an obvious forerunner to the character of Arthur “The Fonz” Fonzarelli on Happy Days.
The word ginchy is 1930s slang related to ginch, meaning an attractive woman.
The Annotated Gilmore Girls 