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when one is too busy to be bothered with something he/she had already committed to doing, especially applicable when letting an entire group of people down
Instead of coming to D&D on time so everyone could start the game, Otto Normalverbraucher was busy thumbing his ass.
by TheBest February 20, 2005
The act of getting kicked out of a gentleman's club by inserting thumb in exotic dancer's anus.
Jimmy got us kicked out because he was thumbing Passion!
by Jerry Lar July 15, 2010
Sticking your thumb up a girls booty for sexual pleasure. Often done when the girl is least expecting it to ensure comic value.
Carter took advantage of the sorority girl picking up change by thumbing her butthole brutally.
by TTmagibbons October 02, 2011
Punishing your significant other by inserting your thumb in her ass without warning. A technique that is crude, but effective. See also, ad hoc.
Thumbing--She wouldn't get ready to leave, so I thumbed her so she would get out the door.
by Bleeding Blue January 16, 2009
the use ofɜ bending one's thumb in purpose for gaming orɜ other things including one hands
john was thumbing his hand console control with vigor through a complicated game level twisting bending steering flexing crooking
by thumper903127 July 10, 2010
The act of verbal coitis or intercourse via text message
i spent all night thumbing shurley
by Uncle tooth December 01, 2009
A dangerous but really fun method of getting high. Also called "The Fainting Game" or the "Thumb Blow" doing the following can give you an intense high for about 5 seconds.

1. Sit in the squatting position.

2. Breathe in and out heavily for 20-30 seconds.

3. Stand up quickly.

4. Blow on your thumb as hard as you can.

When you thumb, you hear voices, see crazy visions, and lots more. It feels like you're traveling through time. When you're high, it seems like all of it happens in a few minutes, maybe longer. But in reality it only lasts a few seconds. You tend you shake and move back and forward in jerking motions, but it's just in your head. The feeling is pretty much indescribable, and it's better than weed.

Sometimes, you could even pass out. When you pass out, you only pass out for a few seconds but you have INTENSE and crazy dreams about a lot of things. When you wake up, you'll be really disoriented and you'll feel extremely awesome but fucked up. After you thumb, you sort of forget what happened when you were high, like, what you saw.

The feeling you get when you thumb is amazing and intense, but only do it a few times. If you do it too much, you could get bad brain damage, or even die. When you thumb, have a friend with you just in case something really bad happens. Don't be too scared though, it's really fun and fucked up.
My friend Zach thumbed in my living room the other day. He passed out, fell backwards and knocked over my goddamn computer and a bunch of other shit. I couldn't stop laughing. Thumbing is crazy.
by DJmidnyt August 27, 2010