Green’s Dictionary of Slang

a mince pie or Christmas pie, as made by Puritans or Precisians some time before Christmas.

c.1698

B.E. Dict. Canting Crew n.p.: Superstitious-Pies, Minc’d, or Christmas-Pies, so Nick-nam’d by the Puritans, or Precisians, tho’ they can Eat em.