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To answer that question you need to understand ten-codes. Ten-codes, or ten signals, are code words used to represent common phrases in voice communication, particularly in CB radio transmissions.
Ten-codes were developed in the 1940s at a time when police radio channels were limited in order to reduce use of speech on the radio. Historically, the codes have been widely used by law enforcement officers in North America.
Ten-codes were later adapted for use by CB radio enthusiasts before its pop culture explosion in the late 1970s. Remember the song Convoy by C.W. McCall in the mid-70s? How about the movie Smokey and the Bandit? Because of these pop-culture gems, phrases such as 10-4 for "understood" and what's your twenty? for "where are you?" were forever embedded into the American lexicon.
"What's your 20" is a phrase meaning the same as the ten-code, 10-20. It is the same as asking "what's your location" or "where are you?".