*Bump (Internet), returning a thread to the top of the list of active threads (acceptable reasons range from wanting to remind others that the question with which the thread started is still unanswered to offering new information that relates to an old thread; a less agreeable practice—as unwelcome as spam—is to do it simply to raise the thread's profile); the term is related to the concept of "bumping (pushing) something up" though others suggest that it is an acronym for "Bring up my post" (however, "bump" applies to any post in a thread, not just one's own posts)
Bump (application), a popular app for the iPhone and Android smartphones which allows users to easily share information between each other.