In a manner that bubbles, fizzes, or displays lively excitement; while effervescing.
From effervescing (present participle) + -ly. This double-suffix formation (verb + -ing + -ly) is grammatically valid but quite rare in modern English usage.
This is a 'theoretical' word that's grammatically perfect but almost never appears in real writing—it shows how English lets us build words even when nobody actually uses them!
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