The poem is about baby Jesus.. at Christmas away in a manger, he discovers rock'n'roll and forms Whitesnake, and is living the rock'n'roll dream. Groupies and sticking stuff up the nose.
He gets addicted to the narcotic Efron, chillaxing in his mancave, hallucinating about a roaming horseman, his dealer.
The dealer stops roaming, full of pain and impossible sadness.
He has a nervous breakdown in the hotel room just before a live gig, and then OD's.
Bob Hoskins kicks the door in, followed my the medics and try to revive him.
To the soundtrack of Pink Floyd's Comfortably Numb.
By this time he's trippin' off his t*ts, imagining Bob Hoskins as the non roaming horseman,
and the hawk is Satan, with dove in his mouth.
Now someone needs to write the next line
I thought you would have guessed what it's about : )