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Phrase(s): Look (at) what the cat dragged in!
Inf. Look who’s here! (A good-humored and familiar way of showing surprise at someone’s presence in a place, especially if the person looks a little rumpled. Compare this with look like something the cat dragged in.) • Bob and Mary were standing near the doorway talking when Tom came in. "Look what the cat dragged in!" announced Bob. • Mary: Hello, everybody. I’m here! Jane: Look at what the cat dragged in!
McGrawhill's American Idioms And Phrasal Verbs