To give someone a hard time undeservedly; to pick on someone. I hear it used this way 100 times per day in the South Bronx (Hunts Point/Longwood area to be precise. I teach 8th grade there.)
"Terrell, sit down and do the test or you're off to see the dean!" "Mistuh, you beastin'! I was just getting up to sharpen my pencil!"
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