When you create multiple screen names for a message board for the purpose of giving your own comments a bunch of thumbs up and/or giving massive thumbs down to someone you disagree with.
by The Master of Expertise February 20, 2013

Kentucky thumb, the act of blowing your firearm up with an old army round and inserting your thumb into the wound to stop the bleeding
by Lemomlimepie6 May 21, 2021

The mobile device equivelant of a page turner.
It comes from the flicking motion your thumb makes as you scroll through a post thread or story.
It comes from the flicking motion your thumb makes as you scroll through a post thread or story.
by BeardedBarista August 18, 2017

Birthday thumb. A new form of RSI (repetitive strain injury) which develops in the thumb after 'liking' all the birthday messages you receive on social media birthday thumb
" hey how was your birthday ?
Fine thanks but my thumb aches from liking all the 'happy birthdays' on Facebook . think I've got birthday thumb
Fine thanks but my thumb aches from liking all the 'happy birthdays' on Facebook . think I've got birthday thumb
by Yolo4ever May 18, 2016

by ASChicagoan May 14, 2015

An osteoarthritic condition in the thumbs created by excessive typing on iPad and iPhone touchscreen keyboards.
by The British Are Coming August 30, 2013

by Tired Today March 21, 2016
