The Flabby Patty Shack is a dining place that is a competitor to the Krusty Krab. The only food they sell is its own Flabby Patty, the Shack's competition to the Krabby Patty. The restaurant was really a trick by SpongeBob to get Plankton and Mr. Krabs to work together in hopes that they would be friends again. The Flabby Patty Shack only appears in the episode "The Other Patty." It was probably demolished or shut down after the events of the episode, as it is never seen or mentioned again.
The outside of the Flabby Patty shack is very small. It is made with many wood planks and has a metal roof with a chimney. It features a window in the front, which allows customers to order and get their food, and a door on the side of the building, leading into the kitchen. It also has a large sign that resembles a Flabby Patty and reads "Flabby Patty" in red.
The inside of the Flabby Patty shack is very tight and cramped. There is a kitchen in the back, where Flabby Patties are made.