The Flabby Patty Shack is a dinning place that is the rival to The Krusty Krab. The only food they sell is the rival to the Krabby Patty, the Flabby Patty. It was really a trick by SpongeBob to get Plankton and Mr. Krabs to work together so they would be friends again. It only appeared in the episode, "The Other Patty." It was probably demolished or shut down after this episode, as it is never seen again.
The outside of the Flabby Patty Shack is very small. It is made with many wood and has a metal roof with a chimney. It also has a large sign that resembles a Flabby Patty and says "Flabby Patty" in red on it.
The inside of the Flabby Patty shack is very tight and cramped. There is a kitchen in the back, where Flabby Patties are made.