Crumbage 

The crumbs that fall down one's cleavage while eating.

"Man, I've been having a lot of crumbage today."

Crumbage by Ladybug25 October 9, 2012

crubage 

n. the mixture of crumbs and bits that are left over in the bottom of a cereal box that is not worth eating. It has a similar texture to pencil shavings and eraser pieces.

The milky crubage is not good! We need new cereal, mom!

crubage by Jelly & Aneezy January 27, 2009