I always see it in the BST section. So what does it mean?
It is an acronym(?) for “Bring Up My Post”.
And topic titles will be fine with just one “!”
Its a simple way to bring a post up to the top of the section. This means old posts can be seen again on the top of the forum. And like Quint said, lets try to keep the titles to 1 maybe 2 exclamation points, shall we? 
ALex
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bump
(Sorry, I just had to do that :P)