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A jacker is someone who tries to steal your stuff, like your paper or your snacks, and they don’t care if you’re hungry or not.
Yo, that jacker just took my lunch money and said, 'I’m gonna eat your snacks too.'
He tried to jack me for my paper and I told him, 'You’re gonna get a black eye for that.'
That jacker came up behind me and took my phone like I was invisible.