Meanings
nounninja rock (plural ninja rocks)
plural ninja rocks
- slangA broken shard of ceramic spark plug, used by criminals to silently fracture the glass windows of vehicles.
Cite this entry
APA
ninja rock. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/ninja%20rock
MLA
“ninja rock.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ninja%20rock. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “ninja rock,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/ninja%20rock.
Source: ninja rock on Wiktionary, CC BY-SA 4.0.