We found 17 dictionaries that define the word fuck all:

General (13 matching dictionaries)

1. fuck all: Merriam-Webster
2. fuck-all, fuck-all: Collins English Dictionary
3. fuck all: Vocabulary.com
4. fuck all: Cambridge Advanced Learner's Dictionary
5. fuck all: Wiktionary
6. fuck all: Dictionary.com
7. Fuck all: Wikipedia, the Free Encyclopedia
8. fuck all: Rhymezone
9. fuck all: FreeDictionary.org
10. fuck all: Mnemonic Dictionary
11. fuck-all, fuck all: TheFreeDictionary.com
12. fuck all: Longman Dictionary of Contemporary English

Slang (4 matching dictionaries)

13. fuck all: Green’s Dictionary of Slang
14. fuck-all: English slang and colloquialisms used in the United Kingdom
15. fuck-all: Colloquial Speech of Carleton County, New Brunswick, Canada
16. Fuck all: Dublin Slang and Phrasebook

Definitions from Wiktionary (fuck all) ▸ noun:  (Commonwealth, UK, Ireland, vulgar) Nothing at all or very little. Phrases: square root of fuck all, more... ▸ Words similar to fuck all ▸ Usage examples for fuck all ▸ Idioms related to fuck all ▸ Wikipedia articles (New!) ▸ Words that often appear near fuck all ▸ Rhymes of fuck all ▸ Invented words related to fuck all