A word often used by folk who have problems existing in a normal society. These people are usually, but not exclusively, virgins and male - most of which supplement their lack of social lives with computer games, wrestling, ventrilo or sometimes LAN, where they get to interact with equally socially inept virgins.
You're now chatting with a random stranger. Say hi!
You: Dicknecks
You: It's like a dick
You: But on your neck
You: You follow?
Your conversational partner has disconnected.