tweaker

noun5

1. •
   A person who tweaks something.

   • That attack may damage the homosexual, but even as he is hurt, he also feels superior, because he is not a bull—a blind, stupid animal. Rather, he is an aesthete—a tweaker, not a charger. — 2018
2. •
   (slang) A person addicted to methamphetamine.
3. •
   (slang) A person seen as demented, crazy, or jittery, or a person displaying those qualities.
4. •
   (slang) A spin bowler.
5. •
   A tool, especially a screwdriver, for making small adjustments.