Why are you asking this under Medical? It means whatever it means to you in a dream. I suppose it could mean you are thirsty!

Moved to Other Arts and Leisure

Sorry, but we don't have dream interpretors here.

Could just be that you were indeed thirsty and it carried over into your dream.

For a woman to dream of hilarious drinking, denotes that she is engaging in affairs which may work to her discredit, though she may now find much pleasure in the same.

Drinking water in a dream might simply mean that you are thirsty. Symbolically, water is related to the unconscious and emotions. Drinking may suggest you are being nourished or have a thirst for emotional involvement.