brb. is an app that acts as your - wait, hold on! BRB! I need more coffee first.
Ok, as I was saying, brb. is an app that acts as an away message for your phone. The next time you are busy with a project, at the movies, or whatever else, you'll be able to open up the app and leave a message that notifies your friends that you are currently away from your phone. AFP? AFK is "away from keyboard", so surely AFP is "away from phone," right brb.?
Check it out and let your friends know that you are busy by letting the app know you are busy!