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When you work your ass off and still end up looking like a complete idiot. Usually happens when you spend more time on something than your entire life.
I studied for 3 weeks and got a D. A for affort, baby.
My essay was 10 pages long and I still got a C. A for affort, I swear.
I spent 4 hours on that math test and still failed. A for affort, I'm out.