Crackerjack /(?)/

Crack·er·jack

Crackerjack

n.
  1. An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis. [Slang]
  2. A preparation of popped corn, candied and pressed into small cakes. The name Cracker Jack(TM) is now a trademark for a similar confection. [U. S.]
  3. something excellent of its kind.

Crackerjack

a.
  1. Of marked ability or excellence. [Slang]