8. I'm of the firm belief that anything someone picks up from fandom should only be used IRL, and then only sparingly. If someone ever writes "aibou" in an RP or fic, I'm totally out of there. However...it's totally legal among friends off-line, unless they do it so often you feel the urge to hurt them. Also, while the "yo" thing is occasionally forgivable, actual Japanese words are not. So, generally, word.

_{Rude Religions are vastly superior to Reno Religions, anyway.}