The present participle of 'hello'; the act of greeting someone with the word 'hello.'
From 'hello' as a verb plus the present participle suffix '-ing,' forming the gerund or continuous aspect form. This grammatical flexibility allows interjections to function as full verbs.
Adding '-ing' to interjections like 'hello' creates wonderfully casual constructions—'We spent the evening helloing and catching up'—that feel colloquial precisely because they treat greeting as an ongoing activity rather than a single utterance.
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