Whiskey-Tango-Foxtrot" is an example of phonetic alphabet, used by the military and film industry to denote letters to avoid confusion between similarly sounding letters ("P" and "B"). Examples are saying "3-Alpha" or "4-Bravo" instead of "3A" or "4B". Broken down by letters, "Whiskey-Tango-Foxtrot" is "WTF", also an internet communication short-hand for "What the f***".