A BUCK OF THE FIRST HEAD. One who in debauchery surpasses the rest of his companions, a blood or choice spirit. There are in London divers lodges or societies of Bucks, formed in imitation of the Free Masons: one was held at the Rose, in Monkwell-street, about the year 1705. The president is styled the Grand Buck. A buck sometimes signifies a cuckold.

Quoted from: Francis Grose, Hewson Clarke, George Cruikshank: Lexicon Balatronicum. A Dictionary of Buckish Slang, University Wit, and Pickpocket Eloquence. London: Chappel, 1811.