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1.
As in "What's your location?" Truckers ask other truckers this question in an attempt to triangulate smokey's location.
Bud says, "Jed, you might wanna mind your meter, the bear is round the bend."

Jed says, "that's a 10-4, whats your 20"?

Bud: marker 27.

Jed: I got my eyes on.

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often shortened to: "what's your 20?" or just 20? when texting
by Mr Major July 02, 2008