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A smug, annoying guy who thinks he's the best at everything, even when he's clearly not.
My cousin is such a n33n3r, he bragged about his 9mm for an hour and it turned out he couldn't even aim straight.
That guy in my class is a n33n3r, he calls himself a hacker but he can't even log into his own account.
My friend's n33n3r brother showed up at the party and tried to flex his 9mm like it was a real weapon.