When you go to open a door, and either it is locked and won't open, or it is a door with a bar and you push on the wrong side of the door and it won't open for you. Like getting Owned by a door.
A joke,in where the desired result is to get the victim to answer the question, allowing you to follow up with "D's (dicks)in yo mouf (mouth)!". The question mostly asked is "whats your favorite number?" or "whats you favorite color?"