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A magical hammer that smacks you in the face with insults and bad opinions. People use it when they're too lazy to think and just want to yell at you.
J Hammer: "You think you're cool? I saw you eating pizza at 2 a. m. alone!" #JudgementAlley
My mom called me a J Hammer for liking anime instead of going to the mall.
He's a J Hammer for thinking he's better than everyone just because he has a tattoo.