Prig

A thief, a cheat: also a conceited coxcomical fellow.
a conceited, stuck-up, over-knowing person; one who appropriates or adopts a manner or costume not suited to him.
a thief. Used by Addison in the sense of a coxcomb.—Ancient Cant, probably from the Saxonpricc-an , to filch, &c.—Shakspeare. Prig , to steal or rob. Prigging , thieving. In Scotland the term prig  is used in a different sense from what it is in England. In Glasgow, or at Aberdeen, “to prig  a salmon” would be to cheapen it, or seek for an abatement in the price. A story is told of two Scotchmen, visitors to London, who got into sad trouble a few years ago by announcing their intention of “prigging  a hat” which they had espied in a fashionable manufacturer's window, and which one of them thought he would like to possess.