Thumb Knuckle

Port Huron, Michigan
Located around the Knuckle of Michigan

Scotty- "Hey, im headed up to Thumb Knuckle for the weekend"

Tommy- "I Have family that lives there!"

by Super Jenius October 13, 2008

shit stained thumb knuckle

Its when you wipe your ass after a particularly filthy dump and you get a shit stain your thumb knuckle.

I was pleased to finally get the key to the executive wash room, however Stan Phillips was not pleases to see that I had a shit stained thumb knuckle when I shook his hand at the share holder meeting.

by jim dandyy June 13, 2011