What does "mad chubs" mean? Is it a common word that I can use?
"Mad chubs" here refers to being very fat or very chubby. "Mad" is an informal way of expressing "so much", "so many" or "very". The term "chubs" here means fat. This is not a common expression to use. It would be more common to say "how did I get so chubby" or "how did I get so fat" in this case.
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