What does bump mean? I feel kinda stupid not knowing...

It's just when somebody uses a reply on a topic/thread to get it back to being on the "latest" list, like making it active again. This way, more people can see the post without having to scroll through pages of other topics, and will therefore be noticed more easily. Don't feel stupid for not knowing, I didn't understand it until half of a year of using forums had passed.

Thanks :D