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To jackneer: verb. To mess something up so bad it feels like you just peed in a soup kitchen. You make everything harder for everyone else while you’re trying to look cool.
I tried to jackneer the test, but I failed it and the teacher gave me a sour look.
He jackneered the game by tripping the goalie and falling into the goal.
She jackneered her math homework by drawing a mustache on the teacher’s face instead of doing the problems.