Plural of chub; either multiple round fish, or informal slang for chubby people or things.
From 'chub,' a freshwater fish name of obscure origin, possibly related to Old English 'ceafl' meaning cheek, since chub fish have prominent cheeks.
The word 'chub' is one of the few animal names that became common slang for chubby people without becoming offensive—it stayed relatively neutral because the original fish really does look round and cute!
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