In a drunk manner; in a way that shows intoxication or excessive alcohol consumption. It describes how someone is acting or speaking while drunk.
From 'boozy' (from 'booze' + '-y') + the adverb suffix '-ly' (Old English '-lice'). The form emerged as 'boozy' became established and writers needed an adverbial form.
The adverb 'boozily' is hilarious because it suggests someone is actively and obviously drunk in their manner—not just intoxicated but making it everyone's problem! You can almost hear the slurred speech in the word itself.
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