Bump is a way to move a thread to the top of the page. People use it for subjects that are important or if they feel people might not have seen the subject when first posted. Besides "bump" you will also see "TTT" used. TTT means "to the top."
Moderator Crohn's Disease & Osteoarthritis Forums
CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, asthma, severe allergy and a host of other medical problems.