Why am i so thirsty when i drank so much last night?

So we had a chinese new year BBQ round at my gaff last night. Good times. Its was Pick's last night here in HK before he shoots off to the land down under (Where women glow and men plunder?
Can't you hear, can't you hear the thunder?
You better run, you better take cover."

Buying bread from a man in Brussels
He was six foot four and full of muscles
I said, "Do you speak-a my language?"
He just smiled and gave me a vegemite sandwich
And he said,

"I come from a land down under
Where beer does flow and men chunder
Can't you hear, can't you hear the thunder?
You better run, you better take cover."

Lying in a den in Bombay
With a slack jaw, and not much to say
I said to the man, "Are you trying to tempt me
Because I come from the land of plenty?"
And he said,

"Oh! Do you come from a land down under? (oh yeah yeah)
Where women glow and men plunder?
Can't you hear, can't you hear the thunder?
You better run, you better take cover.)

. Anyways, here's a snap of the harbor for everyone else who wan't up for braving the crowds and the cold!