The most chubby; having the greatest degree of roundness or plumpness.
Superlative form of 'chubby,' created by adding the '-est' suffix, following the standard English pattern for forming the highest degree of comparison in short adjectives.
The superlative forms '-est' appear in some of the oldest English words (best, worst, oldest), showing that comparing extremes has been important to English speakers for over a thousand years!
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