Smartass, sly fox, sneaky bastard. A highly common, vulgar-colloquial idiom literalized as “a cunning arse”, combining the adjective хитрая (cunning, sly, crafty) with the noun жопа (ass, arse). In modern Russian, it is used to describe a highly resourceful, opportunistic, or manipulative person who always manages to avoid trouble, exploit loopholes, or turn any situation to their own advantage. While technically vulgar, it can be used with a mix of begrudging admiration or frustration.
Так чем же ты недоволен, Хитрая Жопа?
So, what are you unhappy about, smart ass?
(Михаил Веллер, Самовар, 1997)
