The obvious meaning to this song is two people drinking a bottle of wine together, she pops the cork, he fills her glass, they sit and drink until the sunrises.
It seems relevant enough that these two people are lovers from the lyrics abouts his feelings towards her.
The Bottle and cup is a metaphor for s*, he has the bottle, she has the cup (create the image in your head) and he intends to make love to her.
"When you are empty i will fill you up" Meaning that at the climax of their sexual enconter there will be sexual juices.
"I have a thirst only you can satisfy" His sexual desire for her.
"I'm heading home, like a steaming train" He is well on his way to climax.