We found 3 dictionaries that define the word jack all:

General (1 matching dictionary)

1. jack-all: Wiktionary

Slang (2 matching dictionaries)

2. jack all: English slang and colloquialisms used in the United Kingdom
3. jack all: Urban Dictionary

Definitions from Wiktionary (jack all) ▸ noun:  (mildly vulgar, slang) Nothing. ▸ Words similar to jack all ▸ Usage examples for jack all ▸ Idioms related to jack all ▸ Wikipedia articles (New!) ▸ Words that often appear near jack all ▸ Rhymes of jack all ▸ Invented words related to jack all