Look at what the cat dragged in!
look what the cat('s) dragged in
A mild and usually playful insult used to announce someone's arrival and suggest that the person has a messy or otherwise disheveled physical appearance. When Jennifer came in soaking wet from the rain, Candice laughed and said, "Look what the cat dragged in!" Hey, everybody, look what the cat's dragged in. How's retirement treating you, Joe?
Look (at) what the cat dragged in!
imperative Well, look who has just arrived! Look what the cat dragged in! I thought you would never get here.