Definitions:

1. Refers to someone who drinks a beverage heartily or with enjoyment, especially in large gulps or frequently. NOUN
   • The tavern was filled with merry quaffers raising their mugs in song.
2. Someone who drinks deeply, often alcoholic beverages, with enthusiasm or gusto. NOUN
   • He's known quaffer of fine wines and local ales.

Synonyms:

• boozer
• drinker
• guzzler
• imbiber
• reveler