LUKE: Not everybody likes it that strong.
LORELAI: Well, then I shall convert them. I am the Jehovah’s coffee girl.
Jehovah’s Witnesses is a non-mainstream Christian denomination which emerged from the Bible Study Movement founded in the 1870s by Charles Taze Russell; after his death, a breakaway group headed by Joseph Franklin Rutherford took control and chose the name Jehovah’s Witnesses in 1931.
Jehovah’s Witnesses are probably best known for their door-to-door preaching, distributing evangelical literature. Lorelai sees herself as similarly working to convert people to strong coffee.
The Annotated Gilmore Girls 