Thumb-kin

verb.
"Givin someone a thumb-kin"

Sticking your thumb real hard and fast into someones anus.

"I'm gonna give you a fucking thumb-kin, dude"
"Look man, you want me to do a thumb-kin"
"Yo niggaz bettah watch out cuz when i do ma thumb-kin"

by Simon Talek September 10, 2006