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1.
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".
by FunksterJ September 09, 2006
 
2.
He whose bum, or ass, is stinky.

Poor anal hygiene.
Fucking hell, Stinkbum, wash that pungent shit off your asshole you dirty cunt.
by Flapjackandy May 26, 2008