Superlative form of cutesy; the most affectedly or excessively cute, often in an annoying or artificial way.
From 'cutesy' + '-est' (superlative suffix), making it the highest degree of the quality being cute in an excessive manner.
The fact that we have a word for 'aggressively cute to the point of annoyance' shows how precisely English can express subtle judgments about tone and sincerity.
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