noun
A person who participates in hacking or breaking into secure computer systems, typically for fun or as a form of activism.
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The phreaker was arrested for hacking into the company's database.
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I heard that phreaker is really good at bypassing security systems.
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That phreaker is a real pro at messing with phone lines.
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In the world of technology, the phreaker is like a modern-day Robin Hood, stealing from the rich corporations and giving to the digital underground.