what's your 20?

The phrase essentially means, "What is your location?" or "Identify your position," but is a corrupted phrase from the original "10-20" used by United States law enforcement to verbally encode their radio transmissions to that non-police listeners would not easily discover police operations, as well as to communicate quicker and more efficiently by standardizing frequently used phrases.

These verbally-coded messages were called "10 codes", of which "10-20" stood for "Identify your position," or "Where are you?" originally. Other such codes include "10-7" meaning the officer was busy such as with a traffic pull-over, "10-8" meaning that the officer was back on patrol such as from having just written a citation, the popular "10-4" as an affirmative, "10-10" as a negative and "10-22" to disregard a previous transmission have only seen light integration into common use. It was not uncommon for a city to have its own set of particular 10-codes for other phrases frequently used particular to that locale.

This code-phrasing is similar in design to Amateur Radio Operators' (which require an FCC license) use of Q-signals, such as QTH ("What is your location") and QSL ("affirmative/understood") used to reduce the time needed to transmit and interpret a Morse-code transmission.
A: What's taking so long?
B: I'm at a red light that won't turn green even though there's no cross-traffic.
A: What's your 20?
B: Avenue F and Kingston.

A: QSL.
by thehomeland January 20, 2012
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20 goto 10

Refers to BASIC (programming language). When executed, this line would create an infinite loop, continuously re-executing whatever instruction was on line 10 (usually a PRINT statement).
10 print shit fuck crap
20 goto 10
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didn’t go 20

Term Rut Daniels uses if the animal didn’t go 20 yards before collapsing after the shot.
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July 20

If you were born on this date, you're a low-life dirty bitch, tbh who is even born on this shitty ass day?
Person 1: Did you hear their birthday is on July 20th?

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4/20 eve

Ganja Claus leaves presents for you on 4/20 eve
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20 second breakfast

a Monster Zero Ultra. common term used on IRC and Mumble servers.
Man, I'm tired. Time to have a 20 second breakfast!
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