Chum has multiple meanings depending on the context. Here are some of the most common meanings:
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Chumming for fishing: Chumming is a fishing practice where meat-based groundbait called "chum" is thrown into the water to lure various marine animals to a designated fishing ground, so the target animals are more easily caught by hooking or spearing. Chums typically consist of fresh chunks of fish meat with bone and blood, the scent of which attracts predatory fish, particularly sharks, billfishes, tunas, and groupers.
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Planktons signature ingredient in SpongeBob SquarePants: In the animated TV show SpongeBob SquarePants, chum is the signature ingredient in all of Plankton's menu items. In real life, chum is bait used by fishermen, made out of chopped fish.
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A close friend: Chum can also mean a close friend or pal.
In summary, chum can refer to a type of bait used in fishing, a fictional ingredient in a TV show, or a close friend.
