Saying "they know our 20" or "what is your 20" is shorthand for location, which came from the "10-codes" of radio communication. They found great use by law enforcement and military, although civilians used these in the heyday of Citizens Band and Ham radio.
What is 10 20 in police code?
Police 10 Codes
|Code||General Purpose||APCO (Association of Police Communications Officers)|
|10-21||Call ( ) by Phone||Call ( ) by Phone|
|10-23||Arrived at Scene||Arrived at Scene|
What does Breaker Breaker One Niner mean?
A truck with one (or both) of its headlights out. May be followed by either the channel number, indicating that anyone may acknowledge (e.g. "Breaker One-niner" refers to channel 19, the most widely used among truck drivers), or by a specific "handle", which is requesting a particular individual to respond.