shit thumb

when a girl is riding you backwards and you stick your thumb up her butt and you get shit on it.

last night this chick rode me backwards and i stuck my thumb up her butt. when i woke up in the morning i had shit thumb!

by shizzle07 July 16, 2007

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