A fork of Rural Dictionary
Name Rank and Serial Number are the only things that a POW is supposed to give to his captors. This has lead to it being used to signify lying or being unresponsive to the questioning of authority figures.
Employee 1: I saw the boss grilling you in his office did you tell him I put the gay personal ad in the paper with his name and home phone? Employee 2: Don't worry about it man, Name rank and serial number.