To bump, as Nerull said, is to post in a thread with the sole purpose of moving it to the top of page 1. But, it is not always the thread starter who bumps a thread. Threads are bumped all the time in a forum situation for whatever reason... a help topic might be bumped because of more help being needed on the same problem; whereas a thread with (semi-)important information may be bumped for newbies to read.
Also, I would say that at Ironworks atleast, bumping for whatever reason is not considered bad etiquette, unless you do what someone did a few months ago in the Darkstone forum; and bump many many topics at once purely for the sake of bumping them.
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