What is On Your Six?
1.
directly behind you. from the military designation of location where 12:00 is directly in front of you, 3:00 is to your right, 9:00 is to your left, etc.
Hang on, we've got two Japanese Zeroes on our six! I'll try to shake them!
See
2.
Watching your every move, after you, hunting you down.
If you dare mess up this deal I'will be on your six.
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1.
of, relating to, or characterized by a tendency to direct sexual desire toward another of the same sex - generally manifesting itself in..