The phrase comes from military life and is also heard as "on your six." The phrase means beware of things at your '6 o'clock', or behind you.
What does on your six mean - trivia question /questions answer / answers. ... 6 or six - Used as a slang term by military and civilian pilots and ... "You had better watch out, or I'll be on your six faster than a surface-to-air missle.
Definition of 'Watch your six' from our dictionary of English idioms and ... This idiom means that you should look behind you for dangers coming that you can't ...