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

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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

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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

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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

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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

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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

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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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