English · Slang Attested

ninja rock

In real, traceable use. Part of the curated seed collection; community review is coming.

Both English Tiếng Việt

Meaning · English

A broken shard of ceramic spark plug, used by criminals to silently fracture the glass windows of vehicles.

Nghĩa · Tiếng Việt

Một mảnh gốm bị vỡ, dùng bởi tội phạm để làm vỡ kính xe một cách im lặng

Machine-translated — suggest a fix

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “ninja rock” mean?

A broken shard of ceramic spark plug, used by criminals to silently fracture the glass windows of vehicles.

Is “ninja rock” formal or informal?

ninja rock is generally slang.

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