1. A recent commercial declared by Stephen Colbert to be a beacon of hope that will lead us to regaining our cultural unity as a nation.
2. A synonym for unbelivable used for humorous effect.
1. "If America is to prevail in World War III, we'll need some sort of common experience to bond us as a people... I believe the love for the word "Crumbelievable" is just the thing we need. Soon enough we'll be seeing crumbelievable t-shirts selling like hot cakes.
2. "Gas prices these days are outrageous! Crumbelievable, even."
A fat woman's belly, typically seen protruding between a midriff shirt and low rise jeans. Often has the appearance of a blubbery spare tire. Generally makes an excellent jerk-off location.
Look at the cumbelly on that fat hoe! Feed that bitch a sausage and she'll let you have your way.
When a person is engaging in sexual endeavors and starts feeling crumbs and the partner says it's just bread crumbs and the other partner says "I don't believe it"