They are small oval-shaped chunks of chum that resemble chicken nuggets in shape. Customers eat them out of love for the location they are served in, or for the slogan, but not necessarily for their strange taste. A machine tube dispenses the chum into a small polystyrene foam container commonly used for takeout at restaurants.
Role in series
"Chum Bucket Supreme"
Plankton's sign "Chum is Fum" attracted many customers. As in the Chum Caverns, customers could not resist the name or the slogan, and continued to eat chum nuggets despite their repulsive taste.
Customers hated the taste, but due to the decor of the Chum Caverns, they couldn't resist spending money and eating the chum nuggets.
Plankton offers some chum nuggets to impatient costumers waiting in line for the Krusty Krab drive thru, but after an old fish runs him over twice, Plankton says "Chum nuggets. Get them before... my arm falls off."
SpongeBob orders chum nuggets for Patrick while he is at the Chum Caverns. However, Patrick eats his chum nuggets because he was hungry.