What does “bump” mean?
Whenever a new post is added to a topic, that topic moves up to the top of the list. So people post “bump” to “bump” their topic to the top of the list. Most people who post “bump”, however, never give anyone a chance to reply. They just mindlessly “bump” until someone answers. So, if you don’t want to appear rude, impatient, and self-centered, then consider waiting patiently while people type their replies.
When someone has no comment of their own to add to a thread, but they feel the thread should be seen, they can “bump” it to the top of the board. Sometimes old threads are also bumped because they relate to a question on a more recent thread. Other words are occasionally used, like “top”, “nudge”, or “smack”.