The act one sticking one's thumb up someone's ass. Similar to wedgies and wet-willies, thumbkins are generally considered more 'classy' and are often used in gentlemenly situations.
"I say, I do believe I have received a thumbkin!"

"Thankyou sir may I have another?"
by Son September 13, 2003
6 more definitions
8 Words related to Thumb-kin
Top Definition
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
Crazy ass gun wielding honkies from the "thumb" of the State of Michigan.
Terry Nichols was building bombs to level government buildings, but what else can you expect from a thumbkin?
by RandalPnk October 01, 2007
noun

Something that giving a thumbs up to is greatly ironic.
The definitions of "thumb-kin" are thumb-kins.
by Palec Smuk January 21, 2007
noun

Something that giving a thumbs up to is greatly ironic.
The definitions of "thumb-kin" are thumb-kins.
by Palec Smuk January 26, 2007
1. (n) A small, thumb-sized penis.
2. (n) The owner of a small, thumb-sized penis.
Just between you and me, Phil is a thumbkin.
by Heptune May 11, 2005
When someone sticks their toe in your anus while going down on you at the same time.
Kimberly was mortified to hear that Christy let that carnie give her a thumbkin. What a ho!
by GTizzle1386 May 19, 2015

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