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.
by pammyv December 12, 2010
2 more definitions
Symptom when you scroll with your Ipod too much and it hurts.
My iPod gave me iThumb.
by John Zhong March 02, 2008
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
by akas1129 October 05, 2010