Wordnet 3.0
NOUN (1)
1.
a person who drinks heartily;
The Collaborative International Dictionary of English v.0.48:
Quaffer \Quaff"er\, n.
One who quaffs, or drinks largely.
[1913 Webster]
WordNet (r) 3.0 (2006):
quaffer
n 1: a person who drinks heartily