Informal slang meaning to gain weight or become noticeably chubbier, often used in a self-deprecating or lighthearted way. To chub up is to fill out — whether from comfort eating, a sedentary period, or just getting older. The phrase lacks serious malice and is more often used in a resigned or jokey tone than as a genuine insult, particularly when people reflect on changes to their own body.
He definitely chubbed up over winter, but honestly so did everyone after all those holiday dinners.
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(slang) To become chubby; to grow fat.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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