It means when you hold the shift key down for too long and as a result, you end up with two capital letters where there should only be one. Derived the fact that if you do shift+1 and shift+2 you get !". Commonly found in names.

NOTE: The names in the example are just roleplay characters, not people in real life.

If you put it all in capitals, it's ¬-|
Person: It would be nice if TOm and Kevin were friends.
Me: Sure! Total !" though
by Walking Talking Dictionary March 17, 2007
Get the !" mug.