A Dikfore is not neccesarily a thing as much as a joke. When you call someone a Dikfore, eventually they will ask the question "What's a Dikfore?" The point is to get a friend to ask this question which sounds a lot like "What is a Dick for?" then you can come up with own answer.
billy: joe you are such a Dikfor.
joe: what the hell is a Dikfore?
Billy: well in your case its for shoving in another guy lololololololol.