by Oyeboman May 14, 2011

by Xboxer September 25, 2010

The lack of exercise caused by being on a portable game device or smart phone for extended periods of time. Typically Apple or Blackberry users
by Cyberwulf July 18, 2012

While popularly used as the term for approval (thumb's down for disapproval ) Not many know that in rap or in Fighting word's thumb's up means safety off due to the motion of taking the safety off is putting your thumb's up.
by AllFatherOfFighting October 21, 2018

medical term: a tear of the ulnar collateral ligament of thumb, causing the thumb to bend sharply away from the plane of the hand
by dadzone June 19, 2010

Book thumb is from holding open a book with your thumb and index finger for long periods of time, causing pain in your thumb muscle.
by blueberrypancak September 2, 2013

The arthritic fatigue you experience in your thumb after spending too much time scrolling up and down on Grindr.
Damn, I just wasted two hours refreshing Grindr and can barely move my thumb now - got a case of that Grindr thumb!
by C Burnett July 25, 2014
