Bump: (from wikipedia) To bump a thread on an Internet forum is to post a reply to it purely in order to raise the thread's profile. This will typically return it to the top of the list of active threads. The term "to push-up" a thread is also used to describe this type of action. It has been suggested that "bump" is an acronym of "bring up my post", however this is almost certainly a backronymand the usage is entirely consistent with the verb "bump" which means "to knock to a new position". It can also be used in personal messages (PMs) or instant messages (IMs) on theWeb, to return an older message to the top of the list.