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A nasty is when your boss sends you an email that makes you want to throw up and quit your job because you messed up something stupid.
Your boss emails you: 'You messed up the entire report. What were you thinking? I'm so embarrassed.'
Your coworker gets a nasty from the boss: 'You're the worst. I should fire you.'
Your email from your boss reads: 'You're a disaster. I'm going to fire you.'