Re: New guy here.
Bringing Up My Post.
OK, it probably doesn't really mean that but it amused me. I really don't remember when the "bump" terminology started, but I do recall, years and years ago, that people would go to knock their ad back to the top of the list (and so the front page) and would often make a post like, "Bumping my ad up to the top!"
It soon just became "Bump!" or, inexplicably for some, "bumb".