stink bum Share definition Flag A person with a very stinky bum, ie. they are very cute and appealing but must be made to think that their rear end smells. You are a "stink bum". Also good when used in conjunction with "Poo Face", for example as a greeting - "Hello, Stink Bum Poo Face". stink bum by FunksterJ September 15, 2006 Get the stink bum mug.