sharp cookie
One who is intelligent, bright, or sharp; especially, one who can identify attempts to deceive or mislead.
She's a sharp cookie and will have no trouble seeing a sales pitch for what it is.
noun
A small, flat, baked good which is either crisp or soft but firm.
A sweet baked good (as in the previous sense) usually having chocolate chips, fruit, nuts, etc. baked into it.
A bun.
An HTTP cookie.
A magic cookie.
verb
To send a cookie to (a user, computer, etc.).
We have already discussed the benefits — even the necessity — of cookieing visitors so that we can track their return visits to our Website.
At Oracle, they cookie you before and after you register.
noun
Affectionate name for a cook.
More than a little apprehensive myself, I went out to the kitchen. Cookie, deep in a murder story, rocked peacefully beside the glowing range.
"You must show cookie here how grateful you are for all the trouble she's taken." The boy didn't move. "Go on, get on with it," the Trunchbull said. "Cut a slice and taste it. We haven't got all day."