in my guild we often say "
bbl" ->
be back later together with "afk"...
"afk, bbl" <- when ur leaving and don't really know how long you'll be away. If ye know, we just add that so we say "afk, bbl probably within X min"
and we just shout "add" when we get aggro.. there's never time to write more than that

(in fact, we usually just get a "HAHAHHA" from the first person that drops because of the add)
