Magnum Mania!

In The Big Blow, when Wanda and Rollie come into the house, Magnum asks them if they would like something to drink. Wanda orders a Mai Tai and I can't really understand what Rollie is ordering. It sounds like:
Gwa-see-ay.

Does anyone have an idea what he is really saying? If you know, please tell me the name of the drink.

Thanks.

Perhaps he was asking for Courvoisier, a type of cognac.

Thanks, that makes sense. Now I can stop rewinding and listening over and over again.