(informal) Impudent; impertinent; impertinently bold, often in a way that is regarded as endearing or amusing.
1899, Rudyard Kipling, Stalky & Co., chaper 4:"Shut up," said Harrison. "You chaps always behave as if you were jawin' us when we come to jaw you.""You're a lot too cheeky," said Craye.
1909, P. G. Wodehouse, The Swoop! or How Clarence Saved England, chaper 7:The Young Turks, as might have been expected, wrote in their customary flippant, cheeky style.
