big enchilada

noun2

1. •
   (slang) A very important person, especially the highest-ranking individual in an organization.

   • The detectives were trying to identify the big enchilada who controlled the entire criminal network.
2. •
   (slang) Some item of high value, especially a top prize or reward.

   • When the lottery results were announced, he was stunned to learn that the big enchilada was all his.