an impertinent, presumptuous person, esp. a young man; whippersnapper.
2.
an impudent, mischievous child.
3.
Archaic. an ape or monkey.
Origin: 1400–50; late ME Jakken-apes, lit., jack (i.e., man) of the ape, nickname of William de la Pole (1396–1450), Duke of Suffolk, whose badge was an ape's clog and chain