We found 12 dictionaries that define the word G-men:

General (8 matching dictionaries)

1. G-men: Merriam-Webster
2. G-men: Oxford Learner's Dictionaries
3. G-men, G-men: Collins English Dictionary
4. G-Men, G-men, g-men: Wordnik
5. G-men: Wiktionary
6. G-men: Dictionary.com
7. G-men: Stammtisch Beau Fleuve Acronyms
8. G-men: TheFreeDictionary.com

Computing (2 matching dictionaries)

9. G-men: Webster's New World Hacker Dictionary
10. G-men: Encyclopedia

Miscellaneous (1 matching dictionary)

11. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

12. G-men: Urban Dictionary

(Note: See g-man as well.)

Definitions from WordNet (G-man) ▸ noun:  a special law-enforcement agent of the Federal Bureau of Investigation ▸ Also see g-man Similar: giant, Gotham, G. I., G.I., Garden State, gomer, G.I. Joe, Giggsy, Gothamite, Gibby, more... Opposite: criminals, outlaws, lawbreakers Phrases: G-Men from Hell, more... ▸ Words similar to G-men ▸ Usage examples for G-men ▸ Idioms related to G-men ▸ Wikipedia articles (New!) ▸ Popular adjectives describing G-men ▸ Words that often appear near G-men ▸ Rhymes of G-men ▸ Invented words related to G-men