Sarcastic response to any question that has an incredibly obvious answer. The humor lies in that you're mockingthe person who asked the question by jokingly asking a question that has an obvious answer. See "Is the Pope Catholic".
a more vulgar way to say "Does a chicken have lips?". A sarcastic way to answer a question with a question. You could say "Does a brown bear crap in the woods?" instead. Either way, the other person is supposed to say "yes".