Erm... Are you talking about the "Word Bump" game that is in the Games section? Or bumping in the forums? Because bumping in the forums you can do by posting random things that bump up the thread to the top of the forum, but the most common way to do that is just posting the word "bump"... As far as prizes, I have no clue... sweatdrop
If there is a specific thread saying that if you bump a certain amount of times and get a prize, you'd have to ask the owner of the thread what that prize is... I can't really say, since I don't go into that part of the forums. xp