They are small oval-shaped chunks of chum and are a parody of chicken nuggets. They resemble McDonald'sChicken McNuggets, but are made of chum instead of chicken. People eat them out of love for something (the decor or 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.
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 ate his chum nuggets because he was hungry.