1. 'be right back'- i'll be back soon. usually used in chatrooms or msn when the sender needs to take a huge dump but is too scared to say 'i need to do poos'.
-a polite way of letting the other person/people know that if they send messages you aren't going to respond for a bit.
-a good way to delay a conversation if you are sick of them
basil: hey wat you up to tonight?