If you're new to internet chat, you'll need to know how to say you're stepping out and that you'll be right back (BRB) or that you're currently amused so much that you're rolling on the floor laughing (ROFL). And, you'll definitely want to know if the rest of the chat group thinks you're "lurking," or simply sitting in on a discussion without participating. Enjoy these shorthand secrets. L8R (goodbye).