nutcracker

noun5

1. •
   An implement for cracking nuts.
2. •
   Ellipsis of nutcracker doll.
3. •
   Any bird of the genus Nucifraga in the crow family.
4. •
   (informal) Something that is difficult to figure out; a puzzle.

   • I hadn't been to school for a while so the math was a real nutcracker — 1978
5. •
   (US) A bootleg mixed drink made from a blend of alcohols and fruit juices.