We found 4 dictionaries that define the word jack squat:

General (2 matching dictionaries)

1. jack squat: Dictionary.com
2. jack squat: Wiktionary

Slang (2 matching dictionaries)

3. jack squat: Green’s Dictionary of Slang
4. jack squat: Urban Dictionary

Definitions from Wiktionary (jack squat) ▸ noun:  Synonym of jack shit. ▸ Words similar to jack squat ▸ Usage examples for jack squat ▸ Idioms related to jack squat ▸ Wikipedia articles (New!) ▸ Words that often appear near jack squat ▸ Rhymes of jack squat ▸ Invented words related to jack squat