cheeky

adjective4

1. •
   (informal) Impudent; impertinent; impertinently bold, often in a way that is regarded as endearing or amusing.

   • '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. — 1899
2. •
   (UK, informal) Indulged in as a treat, especially an unhealthy one.

   • Although sometimes I'd award myself a cheeky McDonald's hangover treat if I did well. — 2009
3. •
   (informal) Tending to expose the cheeks of the buttocks.
4. •
   Poisonous (of animals such as snakes), dangerous, cunning, violent, potent.

   • A death adder is cheeky, a tree snake quiet. Wasps are only cheeky if you hold them in your hand. — 1994