Someone with exceptional skills in a certain field.
A type of firefighter highly skilled in wildfire firefighting without external support, using basic tools that are backpacked in and manhandled about.
A fast freight train.
A dose of recreational drugs deliberately laced with poison.
To give (somebody) a dose of recreational drugs deliberately laced with poison.
Displaying talent.
Highly skilled.
A person who exhibits an extraordinary ability in one subject (often mathematics) whilst being intellectually disabled in many other domains.