Wow! Soup is a type of soup that only appeared in the episode, "Greasy Buffoons." It was sold at the Krusty Krab, before being discontinued. When the customers tried the Wow! Soup, they liked it, but later became sick due to the unhealthiness, resulting in SpongeBob calling the health inspector.
Wow! Soup is pure grease that is served on a paper plate. As shown in the screenshot, it is also shown leaking off, but not dripping off of the plate. It appears to have been suggested by Mr. Krabs because Plankton also had a food made entirely out of grease called "Crispity Crunchities."