A term used in place item that should be spoken about in an esoteric manner, in order to disguise the item in question. The work Dirken could also be used as a term to use in conversation when planning a surprise for a person who might hear the conversation.
"Have you sorted the dirken?",
"yeah we are going to be there at 6 oclock"
The act of steping off of the last stair and thinking there is another following it-- but there isn't, and your foot awkwardly and exaggerantly slams to the surface beneath you.