The condition in which you totally forget that you can Google anything you want to know, and you actually e-mail/IM/call a friend to ask for the information you want.
Wow, not only am I completely out of it, I've also got end-stage Googleheimer's. I actually forwarded yesterday's Googleheimer's definition (a BIG thumbs up) to my friends and asked if btw anyone knew what the "420 community" is. Did I ever feel foolish when they replied. I could have saved myself a lot of embarrassment if I'd just remembered to Google '420'.