The amount that can fit inside one cheek, usually used humorously or colloquially to mean a mouthful.
From 'cheek' + '-ful' suffix meaning 'full of' or 'the amount that fills.' This is an informal compound created by analogy with words like 'handful' and 'mouthful.'
A 'cheekful' is a wonderfully silly word that captures how we stuff our cheeks like squirrels—it's the kind of colorful, playful compound English speakers naturally create when they need a word that doesn't officially exist yet!
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