be tight-arsed
rude slang To be overly concerned with small, insignificant details. Primarily heard in UK, Australia. I asked Molly to proofread our proposal because she's so tight-arsed that she'll definitely notice the slightest mistake! Can you stop being so tight-arsed? The font on the sign is really not a big deal. He's a professor, so of course he's tight-arsed. Come on, he analyzes Shakespearean poetry for a living!
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