Okay, go to the left side of the page, and look under the green heading that says My Boards. Under that heading is a link to click called Bump Board Glossary. Click on it. Voila!
Just like PP said. You also learn a lot of the speak/slang from just lurking on the boards that you like. I highly recommend lurking around before so you get used to the board you wish to post on.
Re: abbreviations?!
This unofficial glossary is very helpful!
https://community.thebump.com/cs/ks/forums/thread/13543381.aspx