It basically means "obviously". Similar to the phrase "Does a bear shit in the woods" or "Is the Pope Catholic" or "Is Snakes on a Plane the best movie ever"
A question used to show how you have no idea what someone is talking about. It comes from Wheel of Fortune when a contestant does not know the correct answer so they say "Can I buy a question mark?" instead of "Can I buy a vowel?"
Question 2 in The Impossible Quiz which is a wordplay.
The answer is "no but a tin can" (C) because the question doesn't mean a matchbox, but it asks if a MATCH CAN DO BOXING, and the answer is "no but a tin can" because it also doesn't mean a tin can but instead, it means that a TIN CAN DO BOXING.
Can a match box?
A. Yes B. No
C. No, but a tin can
D. Yes, one beat Mike Tyson