dump + pin just started showing up as info entered in the registration forms for my hardened phpbb2 forums. These 'folks' weren't allowed to do anything but since they left a footprint (the 'dump + pin', or 'dump', or 'pin'. I am assuming dump + pin refers to a hack to gain entrance to forums in order to spam them. I am also guessing that a spammer forgot to make an adjustment before sending out the rogue bot, which is why I got the 'dump + pin' field entries.
Answering this post will probably give Google something to index other than the hundreds of identical spammed forum posts about selling 'dump + pins', and maybe help others stop them.