What does "Jack Benny in the Red" mean?

If you hear a waitress say "Jack Benny in the Red" at a diner or restaurant, it's just another way to say "Strawberry Jell-O." Benny's radio show was sponsored by Jell-O in the 1930's. There are hundreds of other popular diner lingo phrases - to learn more, check out the links below or browse the rest of our restaurant slang dictionary.