Last Updated
：2025/11/28
ninja rock
（ plural ）
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(slang) A broken shard of ceramic spark plug, used by criminals to silently fracture the glass windows of vehicles.
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ninja rock
The thief used a ninja rock to quietly fracture the car's window while the owner was distracted.
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The thief used a ninja rock to quietly fracture the car's window while the owner was distracted.
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