n (context|usually|_|attributive) An unmarried male, a bachelor; a male not accompanying a female at a social event.
n One who applies for the allotment of shares in new projects, with a view to sell immediately at a premium, and not to hold the stock.
n A social event for males held in honor of a groom on the eve of his wedding, attended by male friends of the groom, sometimes a fund-raiser.