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Webster 1913 Edition

Noun.

One who quaffs, or drinks largely.

Noun.

One that quaffs or drinks largely.

Verb.

To feel out. [Not in use.]

quaffer ‎(plural quaffers)

One who quaffs.
- 1774, Edward Long, The History of Jamaica (page 354)
  It is doubtful, whether we ought to ascribe any superior qualities to the more ancient Africans; for we find them represented […] as proud, lazy, deceitful, thievish, […] devourers of human flesh, and quaffers of human blood […]
(informal) A quaffable wine.