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
Symptom when you scroll with your Ipod too much and it hurts.
My iPod gave me iThumb.
by John Zhong March 02, 2008