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A four horse day is when your boss is a raging lunatic and you have to work your ass off until you can barely move.
My boss said, 'Today is a four horse day!' I looked at him like he was insane.
I had a four horse day and still had to clean the coffee machine.
My coworker said, 'This is the worst four horse day I've ever had!' I agreed, but I was too tired to say much.