What is Smelly Thumb?
1.
When going to the toilet for a piss and unzipping your pants but not the top button, holding your boxers down so that your ball bag stays in your pants and rubs against your thumb while your penis drops out and pisses, then you fart and then once you have finished pissing, smell your finger.
You should detect the smell of fart and ball sweat.
Always wash your hands
