Cop-killer

noun, slang

noun, slang ·Uncommon ·College level

Definitions

Noun
  1. 1
    A person who deliberately kills an on-duty police officer.

    "Serpico spat the words out. "For killing a cop! He's a fucking cop-killer! Tell that to all his fucking friends up there.""

  2. 2
    A Teflon-coated bullet. US, slang

Example

More examples

"Serpico spat the words out. "For killing a cop! He's a fucking cop-killer! Tell that to all his fucking friends up there.""

Etymology

Etymology 1

From cop + killer.

Etymology 2

From the bullet's (bullets') supposed ability to penetrate body armor, thus endangering police officers.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.