What’s your twenty?

Best definition
What’s your twenty?
This is one of many CB slang terms that those operating CB radio used mainly during the CB craze of

the 1970s and 1980s.
Literaly speaking it means: Where are you?

What’s your twenty?” This is asking the receiver what their current location is. This term comes from the ten-code 10-20.

For more info check Wikipedia.org and search for “CB slang”