drunk as David's sow

The story

Francis Grose, in his A Classical Dictionary of the Vulgar Tongue (1785), claims derivation from an instance in which a man named David Lloyd, who was accustomed to showing his six-legged sow as a curiosity, found his intoxicated wife where he expected the sow to be. Grose's dictionary was meant as a work of humour, and this story is almost certainly fanciful. Variants of the phrase predate it by over a century (see e.g. R. Monsey's Scarronides (1665) "As drunk as any Davids Sows" (p. 20)).