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ream (one's) ass
1. vulgar slang To aggressively and angrily rebuke, criticize, or chastise someone, especially for mistake or wrongdoing. I'm going to quit my job—I'm so sick of irate customers coming in and reaming my ass for something I have no control over. The boss reamed my ass for screwing up the accounts like that.
2. vulgar slang To engage in anal sex with one.
ream someone's ass (or butt)
criticize or rebuke someone. North American vulgar slang