G-man

[ jee-man ]

noun

, plural G-men.

1. an agent for the FBI.

G-man

noun

1. slang.
   an FBI agent
2. a political detective

Word History and Origins

Origin of G-man¹

First recorded in 1920–25; probably representing Government man

Example Sentences

"We just figure if he wins there will be a cornucopia of material for us," said a fellow who identified himself as G Man.

From The Daily Beast

Christian Bale becomes Melvin Purvis, the first famous G-man who tracks the gangsters down.

From The Daily Beast