The phrase comes from the picture of a woman golfer kissing a trophy that made the e-mail rounds awhile back. The angle and lighting in the photo made it appear as though she was kissing a penis made of glass.
Commonly made from a small glass tube.
Crack Smoking women are commonly known to give oral pleasure to men for crack or money. Therfore we get the name "Glass Dick".
Pookie: "Yea, looks like it."
Tyrone: "Damn she a crack head hoe."
Non-Tweaker: "I don't even know you, and I don't do speed."
Non-Tweaker thinks to himself, "Fucking tweakers."