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Usually, 20/20 vision is regarded as normal eyesight. However, it is stated to define the lucidity through which a person views something from a 20 feet distance. Whereas, 20/15 eyesight means that you may view something from a 20 feet distance, which an individual with normal eyesight might see clearly from 15 feet.
Answer Wiki. Saying they know our 20 or what is your 20 is shorthand for location, which came from the 10-codes of radio communication. The 10 codes were simply a way to cut on air time and confusion when communicating by two-way radio.