To thumb yourself - to thumb or stick your thumb or finger into ones anus.
Man - "Tom what are you doing?"
Tom - "I'm thumbing myself, it feels very nice."
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Rather than the thumbs up or thumbs down response to something, "thumbs in" denotes an inability to care less. While holding one thumb up and the other thumb down, you then bring both thumb gestures behind you and motion to place both thumbs "in" your ass.
I voted thumbs in last election.
The bump that forms in the zipper of mens' pants that is often mistaken for an erection
Girl: Look at that boner
Guy: It's a thumb goddammit...THUMB I TELL YOU!
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To hitchhike, if you don't have a ride
If you don't like the way I drive, you can thumb it.
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(verb) Using a finger to push a small object into your buttocks.
ED: "Hey Randy how can we make this ecstasy really kick in?"
RANDY: "I say we thumb it!"
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To "like" something on facebook. Telling someone that you like something doesn't necessairly mean that you liked it on the book, but saying "I thumbed that" doesn't need clarification.
Dude, I thumbed that last night
He obviously posted that thinking that everyone would thumb it. They didn't. What a bad athumbtion.
She thumbed everything on my wall. It was a freakin thumbderstorm!
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