A quote from a movie called "die hard", meaning: obviously!
Usually used in phone conversations.
Supervisor: Attention, whoever you are. This channel is reserved for emergency calls only...
Detective John McClane: No fucking shit, lady! Do I sound like I'm ordering a pizza?
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