naguinness
It means someone showed you up in the worst way possible.
I said I could beat my dad at chess. He beat me in one move. That was 'naguinness.'
I said I could bench press 100 pounds. My uncle did it with one hand. That was 'naguinness.'
I said I could run a mile in 3 minutes. I finished in 10. That was 'naguinness.'
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