A vampire that replenishes it's unholy energy by sucking dick instead of sucking blood like a normal vampire.
"The Head Vampire? Like you're the king of all of the vampires?"
"No! I come to suck your dick!"
A Nicklength is a scientific measuring unit, much like a Plancklength. It measures about six inches on a good day. The measurement is derived from the length of an average penis.
"Dude, how tall do you think that guy is? He's huge!"
"He is. He's gotta be at least 14 Nicklengths tall"