The term 'saucy one' can refer to a few different things. The first is 'JACKANAPES, ' which is an old-fashioned term for an impudent or mischievous person, usually a child. It is derived from the name of a character in a 16th century play by Thomas Nashe. The second is 'MINX, ' which is a slang term for a flirtatious or mischievous woman. Finally, 'SNIP' is another slang term for a mischievous or cheeky person, usually a child. All three terms refer to someone who is saucy or mischievous in some way.