Plural of 'fella,' an informal and friendly way to refer to a group of guys or men.
From 'fellow' (Old English 'feolaga,' meaning partner or companion), shortened to 'fella' and pluralized to 'fellas' in casual speech.
'Fellas' is one of those words that instantly signals a specific tone—using it makes you sound friendly and informal, almost like you're automatically inviting whoever you're talking to into an in-group.
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