Spastic finger syndrome 

When you type and can't seem to type correctly. Transposing letters in a word because one finger wants to keystroke before it should. When typing, adding a space in the middle of a word or where it does not belong. Constantly having to click backspace to correct the problem.

I don't know what my deal was in chat last night, must have been spastic finger syndrome.

Spastic finger syndrome by Trent Kuver May 7, 2008