E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A pixy, puck, or fairy. To colt-pixy is to take what belongs to the pixies, and is specially applied to the gleaning of apples after the crop has been gathered in; these apples were the privilege of the pixies, and to colt-pixy is to deprive the pixies of their perquisites.