part of a series of '10-codes' that many security officers & law-enforcement-types use, the '10-20' code refers to receiving a location coordinates from a second party at the other end of the line (over distance radio transmission). '10-4'- meaning that the transmission has been received.
d). The age which is slightly less worthless than 19, and slightly more worthless than 18. The age at which you are considered to be well into fully legal adulthood, yet the government still deems it necessary to babysit certain aspects of your life. Despite the notoriety of turning a new decade, turning 20 doesn't mean a damn thing.
Last night, bobbysmoked exactly twice as many joints as he could count on both of his hands. How many joints did bobby smoke?