this is used often in military acronyms. for example, bravo zulu means "well done", a compliment. it was taken from naval signal manuals meaning the same thing. however, if someone were to say "b z" nobody would understand. if someone used the term whisky tango foxtrot it means "what the fuck?" posed as a question or used as an interjection, it is at least a little more polite than saying the words.