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n. a condition of soreness to one's thumb from overuse on his/her iDevice (iPhone, iPad, iTouch).
Doc says I've developed iThumb and has advised me to stay off my iPhone for a few days.
iThumb by pammyv December 13, 2010
Related Words
When your thumb gets too sore; from texting, playing games, facebooking all on your iPhone!
I have been facebooking for 2 1/2 hours....i am having some iThumb
iThumb by akas1129 October 6, 2010

iPhumble 

When an accidental fumble with your slick iPhone causes an accidental text message send, for example.
iPhumble! Ugh... I did not want to send that yet.
iPhumble by sfjason February 19, 2009