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Dudley had spent most of the summer in the kitchen, his piggy little eyes fixed on the screen and his five chins wobbling as he ate continually.
As I understand, "five chins" is hyperbole implying Dudley is extremely fat. Am I getting it right?
What does it mean exactly?
Yes, you are correct.
double chin: a fold of skin under the face along the front of the neck, caused by a layer of fat
By taking it further and saying Dudley has 5 chins, the author is implying that not only is Dudley fat, he is VERY fat.
