Repetitive strain injury caused by constant use of one's "pinky finger" when using modifier keys in Emacs. This term has been adopted by developers using other editors or IDEs due to frequent use of quotes, ticks, braces, colon, semi-colon. etc. as they are dependent upon the use of the right hand pinky.
God I hate you PHP! Every day I have Emacs pinky because every line requires at least five keystrokes with my right hand's little finger.