Definitions by Niffer and Shaun

grunk 

1.A stain that can't be identified in one's shower or toilet.
2. A large messy fudge dragon left in a clogged john.

1. "Jesus! What's that funky green grunk around the tub drain?"

2. "Damn, I just left the nastiest grunk in your porcelain thrown."

grunk by Niffer and Shaun December 1, 2006