One of your five fingers. That's right! It's a FINGER. The thumb is a finger, so fuck you assholes who say you have four fingers and a thumb!
I'd like to shove my thumb up those people's asses.
by Phlegatu May 11, 2004
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The hip new way to indicate you are texting. Matter of fact; all the really cool kids now refer to texting as "thumbing."
Jenny and I were thumbing most of math class today.

(another correct usage would be)
Thumb ya later!

(another correct usage would be)
I will thumb you later.
by Cyprus Denton Fekks October 01, 2011
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when someone shoves their thumb into a pleasurable area.
nick and steve thumbed anut mar's coochie
by dufa October 12, 2006
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When fucking and you get brewers droop or can't manage anything more than a slack-on, one is required to 'thumb it in'
As seen on many porno's
"Fuck me hard Liam", "sorry petlamb, ive gone all soft i'll just have to thumb it in"
by Diamond Dave April 28, 2004
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Used to describe the appearance of a very obese person whose face and double chin have merged into one unit.
No wonder Bill can't breathe, he's a thumb.
by FergusonTO35 October 19, 2010
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