tweaker

From tweak +‎ -er; the drug addict sense derives from the slang term tweak for methamphetamines, in reference to the punding behavior of addicts.

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tweaker (plural tweakers)

1. A person who tweaks something.
2. A tool, especially a screwdriver, for making small adjustments.
3. (slang) A person addicted to methamphetamine.
4. (cricket) A spin bowler.

• Traweek, retweak