Water on the rocks 

A nerdy way of saying water with ice.

I'm so hardcore I had three water on the rocks last night.

Water on the rocks by The pastamaster April 11, 2011

Waters On The Rocks 

When you're really not in the mood to drink alcohol. Instead you just go with a glass of water, or anything non-alcoholic.

Waiter: "Would you like anything to drink, Sir?"

Customer: "Oh, I'll just have Waters On The Rocks."

Waiter: "I see."

Waters On The Rocks by Freshbott2 April 17, 2011