concrete overcoat

slang Concrete poured over a dead body, as to hide or dispose of it. Used primarily in films and literature describing the activities of gangsters. I gave that stool pigeon a concrete overcoat, boss—he won't be talking to the police ever again. That punk needs to get a concrete overcoat before he can testify in court, got it? I bet Ray went on the run because he knew he'd end up in a concrete overcoat if he stuck around here.

pine overcoat

slang A coffin. You're going to end up in a pine overcoat if you keep driving so recklessly! Don't worry, boss. That stool pigeon will be in a pine overcoat before he ever makes it to court.

put on a/the wooden overcoat

dated slang To die. ("Wooden overcoat" refers to a coffin.) After he retired, he said he wanted to spend his time and money traveling the world before he put on the wooden overcoat. She'll be putting on a wooden overcoat soon if she doesn't start changing her diet and lifestyle.

wooden overcoat

dated slang A coffin. You're going to end up in a wooden overcoat before you're 50 if you don't start improving your diet. Don't worry, boss. We'll put that stool pigeon in a wooden overcoat before he ever makes it to court.