They are small, oval-shaped chunks of chum that resemble chicken nuggets. 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" attracts many customers. As in the Chum Caverns, customers cannot resist the name or the slogan and continue to eat chum nuggets despite their repulsive taste.
Customers hate the taste, but due to the decor of the Chum Caverns, they cannot resist spending money and eating the chum nuggets.
Plankton offers some chum nuggets to impatient customers waiting in line for the Krusty Krabdrive-thru, but after an old fish runs him over twice, Plankton says "Chum nuggets. Get them before... my arm falls off."