the signature hand gesture used in extemporaneous speaking: where you're talking about foreign policy and make a fist with your thumb on top and hold it up to really emphasize your point.
he's so used to using the extemp thumb in speech and debate that i've seen him use it in class presentations as well!
When your thumb gets sore from holding down the throttle on a quad.
(after a whole afternoon of riding on the quad)
"Damn, I got throttle thumb!"
When a person jams their finger in their butt hole to prevent diarrhea from spilling into their pants
-Dude, is that guy scratching his ass in class?
-Naw man, that guy's doing a Thumb Plumb
Texting on two mobile devices while holding one in each hand
"I saw this crazy girl at the club last night. I was going to go talk to her, but she was busy double thumbing at the bar."
kart thumb is a wiinjury that develops on the right hand after frequent and habitual use of mario kart using the Wii Wheel accessory while playing Mario Kart Wii.
The condition arises from the orientation of the controller/wiimote placing the button used to accelerate your kart under the right thumb.
If left untreated the condition can worsen to Wiipetitive Strain Injury and eventually Wiithritis.
Michael played Mario Kart for ten hours yesterday and got kart thumb - by the time he went home he couldn't even bend his thumb.
Cold thumb is Ignoring someone's text message/not typing back/not replying to someone's text.
Keisha: Guapo, when can I come over?
Guapo: …(never responds)
Keisha: I asked you a question, why are you giving me a cold thumb…
the red and/or peeling skin on the finger, usually thumb, of someone who is new to smoking and/or smokes often because they are inexperienced and the lighter flame touches their thumb or finger
Hey man, what's wrong with your thumb?
Oh, I just started smoking, and now I got a smoker's thumb.
Here, let me show you how to use a lighter!
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