The Olympia Café was a fictional greasy spoon featured in a recurring Saturday Night Live sketch.
Staff also included Bill Murray as Nico, a busboy who does not speak English, Dan Aykroyd as short-order cook George, and Sandy, a waitress played by Laraine Newman.
The short-order cook (usually played by Dan Aykroyd) would mistake the retort as an order for more cheeseburgers, loading up an absurd number of patties onto the grill.
According to Don Novello, who penned the first Olympia Café sketch, the diner was based on the Billy Goat Tavern on Lower North Michigan Avenue in Chicago, which is still operating (and part of a small chain).
[1] According to his brother Jim Belushi, John based the character on their Albanian uncle, who at one time owned a hot dog stand on Chicago's Northwest Side.