Thumbitis is the red blistery affect that occurs on the underside of the thumb. The most common cause of thumbitis is too much text messaging with mobile devices.

(as defined on www.thumbcare.com)
I got thumbitis using my Blackberry too long. Now my thumbs are numb and blistered.
by thumbcare.com January 23, 2009
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An imaginary disease which one contracts when they cannot spell due to awkward thumbs. It usually occurs in adolescents, as such individuals simply cannot spell! When one is texting and they misspell a word accidentally, this is when Awkward-Thumbitis occurs.
Person 1: hey, what u foim tonight?
Person 2: what??
Person 1: dammit! *doin I have awkward-thumbitis!!
by woopdidoop March 26, 2018
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