Etymology
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cheeky (adj.)

"impudent, presumptuous," 1859 (1850 as the nickname of a misbehaving boy in a story), from cheek in its sense of "insolence" + -y (2). Related: Cheekily; cheekiness (1841). 

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Definitions of cheeky

cheeky (adj.)
offensively bold;
Synonyms: brash / nervy
From wordnet.princeton.edu