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When someone acts like a total selfish prick, pretending they're helping you when they're really just trying to take advantage of you.
He said he'd help me with my math test, then spent the whole time bragging about his own math skills.
She offered me a job, then made me work 12 hours for minimum wage.
He told me he'd give me a lift, then drove me 20 miles out of his way just to show off his new car.