Wiktionary
smart cookies
n. (smart cookie English)
Usage examples of "smart cookies".
When the linen order arrives, the smart cookies fall onto it voraciously, stashing stacks of the valuable objects anywhere they can hide them.
Cutler, like Tarn and Kanda and even Voorhes, seemed both nice enough and harmless enough, and on their own terms probably were-but they were smart cookies as well, worldly wise, deadly, and survivors in a high-tech high-stakes jungle.