1 definition by I'm a smart one
A bum crumb is an object that is forced up your buttock when you sit on it. It can also be spelt like this: bumb crumb.
What happened doctor? Oh you had a rare inconvenience called a bum crumb also known as the bummeth crumbosis it is when an object becomes suck up ones buttock when they sit on it.
by I'm a smart one April 21, 2020