Definition
A double bogey is when a golfer makes a score 2 over the designated par. For example, if you make a 6 on a "par 4", you have made a double bogey. For beginners, a double bogey is a decent score and will be very common. For pros, it's considered a bad hole, and many pros will go multiple full rounds of golf without having a single double bogey. But they still make them!
Usage
Dang, I made a double bogey again!