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Phrase(s): What’s the scam? [and] What’s the deal?
Sl. What is going on around here? (Often implies that something seems to be wrong.) • There’s a big rumpus down the hall. What’s the scam? • I gave you a twenty, and you give me five back? What’s the deal? Where’s my other five?
McGrawhill's American Idioms And Phrasal Verbs