Smunge is like something getting crunched up, but like softer, like how they make the cars today, they smunge up on impact rather than crunch up. It's basically any kind of soft impact.

When you eat dirt for the first time and leave your family to build a shack in the woods

1. An unidentifiable residual build-up usually found at the bottom of outdoor trash recepticals. Cannot be calssified as animal, vegetable nor mineral. Commonly brown/chunky in apearance.
2. Common term applied to any mystery substance deemed to be of questionable origin or considered harmfull.