Where did the term "What's your 20" originate from?

Answer 1

it's radio slang. it means where are you or what is your present location. as to where it started in the first place....I'm not sure. I know you're not supposed to use it on some secure channels because it is just slang

other radio slang
10-4 acknowledge transmission
10-2000 call 911
10-7 unit out of service
there's more, but I want to forget work right now....