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A person who doesn't want to get any better at what they already suck at.
I tried to teach him how to play guitar. He just kept strumming wrong chords and said 'I'm fine with my hackopotamus level.'
She got a 50 on her math test and said 'I'm not going to improve. I'm a hackopotamus.'
He still uses the same broken laptop from 2010 and says 'I'm a hackopotamus, and I'm proud.'