Quote Originally Posted by wilsonneal View Post
bump is a way to move a post to the top of the "unread messages" queue in an attempt to keep the thread in front of people. it's a gesture from fellow members to say "hey, this is important or useful info, and all you guys should be aware". It is most frequently used in classified ads when the seller believes that people have forgotten about his ad or may not see it because it's buried under newer ads.
Thanks for the info!