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A song about the spirit of the night man that comes into your room at night and pins you down with his strong arms and you try to fight him but he comes inside you and fills you up and you become him. An invention of Charlie Kelly from It's always sunny in Philadelphia.
Charlie: "It's a song about the spirit of the night man coming inside me and I become him- I become the spirit of the night man."

Mac: "It sounds like a song where a man breaks into your house and rapes you"

Charlie: "where are you getting that from?"
by Bluefrawg October 16, 2007
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Night Man is a fictious character from a song used in the television series "It's Always Sunny In Philadelphia". In the song he is portrayed as a mystical figure empowering a mortal man. How ever the lyrics seem to suggest more that he is a homosexual that rapes other men.
"They took you Night Man and you don't belong to them. They left me in a world of darknes with out your sexy hands and i miss you Night Man, so bad."
by Brock Heron October 17, 2007
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A man created by the wacky mind of Charlie day, is the arch nemesis to Dayman and is rumoured to be Charlie’s uncle Jack. Nightman is said to come to you in the night and pin you down and come inside you, one will be screaming a passionate shout during this act and it just involves two men like loving brothers
He is coming!
Who.... who is coming?
THE NIGHTMAN
by Tubby bilbo August 03, 2018
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