1893, Robert Louis Stevenson, David Balfour [aka Catriona], 2009, page 228,
“But ye′ll be for a bite or ye go?” said he.
“Neither bite nor sup,” said I. “I had a good waucht of milk in by Ratho.”
verb
(obsolete) To drink, to quaff.
2000, Association for Scottish Literary Studies, Scottish Literary Journal, Volume 27, Issue 1, page 45,
Scott, on the other hand, says of him that he ‘wauchted [quaffed] the bluid-reid liquor doun’.