G-man

noun, slang

noun, slang ·Moderate ·College level

Definitions

Noun
  1. 1
    A US government agent fighting organized crime in the interwar years. US, historical, slang
  2. 2
    a male special law-enforcement agent of the Federal Bureau of Investigation wordnet
  3. 3
    Any person working for the US government, especially in undercover work. US, broadly, slang

Etymology

Probably abbreviated from government man.

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