The feeling you get when your mind is racing, each thought produces a new semi-related thought and you are unable to focus on any single thought. Much like the dialogue in the commercial for Microsoft's semantic search engine Bing.
I don't think I'm going to be able to finish this project tonight, I'm feeling very bing-brained.
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