(chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.
We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.
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The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
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