Definition
A derogatory term for someone who's acting foolish, annoying, or stupid—a playground-grade insult that somehow remains effective well into adulthood.
Example Usage
Stop being such a buttnibbler and pay attention in class.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=buttnibbler&defid=4477578)
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See “buttnibbler” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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