hotshot

Short definition from Wiktionary

Adjective

1. 1
   Highly skilled.
2. 2
   Displaying talent.

Noun

1. 1
   Someone with exceptional skills in a certain field.
2. 2
   A type of firefighter highly skilled in wildfire firefighting without external support, using basic tools that are backpacked in and manhandled about.
3. 3
   A portable device that is used to jump-start an automobile battery, or the electrical output of such a device.
4. 4
   A fast freight train.
5. 5
   A dose of recreational drugs deliberately laced with poison.
6. 6
   A lethal injection of heroin or another opiate.

Verb

1. 1
   To give (somebody) a dose of recreational drugs deliberately laced with poison.