1. "Jack Squat" as a Unit of Measurement:
* This theory suggests "jack squat" originated as a humorous way to refer to a very small amount, akin to "a grain of sand" or "a drop in the ocean." The idea is that "jack" refers to a small, insignificant person, and "squat" was a slang term for a small amount.
2. "Jack Squat" as a Donkey:
* Another theory links "jack squat" to the word "jackass." "Jack" can be used as a slang term for a donkey, and "squat" could refer to the donkey's posture. This theory suggests the phrase was originally "you know jack ass squat," meaning "you know as much as a donkey knows."
3. "Jack Squat" as a Military Term:
* Some argue that "jack squat" originated in military slang, with "jack" referring to a small, unimportant task and "squat" meaning "nothing." In this context, "you know jack squat" would mean "you have no knowledge or skills."
4. "Jack Squat" as a Combination of "Jack" and "Squat":
* This theory suggests "jack squat" is simply a combination of the words "jack" (used as a general term for a small amount) and "squat" (also meaning a small amount).
Regardless of the exact origin, the phrase "you know jack squat" is used to express that someone has no knowledge, skills, or understanding about something. It's a humorous and informal way to convey that someone is clueless.
It's important to note that the exact origin is difficult to pinpoint with certainty, and different theories have varying levels of support.