A person who will only send an idea, picture, joke, etc to one person via text message or messaging app. A monochatous person will not send the same message to many people to compare their reactions, as this would be unethical.
> I'm monochatous! You have to tell me how this outfit looks, I'm not asking anyone else.
> Bro, who cares just send it to someone else
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi