This is the best song about heroin addiction ever written. It is found on the Katy Lied album by Steely Dan.
Dr. Wu is the dealer, and the protagonist in the song is lamenting the fact that she (the goddess of addiction) has brought the supposedly invulnerable Dr. Wu to his knees.
He'll be waiting for that taste quite some time now, I suppose.
I've always imagined him lying in some bed, staring at the ceiling fan, like Martin Sheen in Apocalypse Now. Except with the cold sweats.