Bibulous

God of wine, also known as Tuvelpit and Smimto (Small Gods), he resembles a fat man who enjoys endless parties with scantily-clad young ladies. He drinks all kinds of colorful drinks with things on the ends of sticks and interesting names. Normally, he does not suffer from any hangover. Described extensively in Hogfather, wholeheartedly hated by Bilious.

Annotation

The Roundworld reference is to Bacchus, also called Dionysus. And as the word Bibulous means given to or marked by the consumption of alcoholic drink he's a remarkably aptly-named God of Wine.