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1 definition by aithros

 
1.
Basically means "I've got your back." Comes from the old pilot system in which directions correspond to hours on the clock, where 12 o'clock is forward and 6 o'clock is behind. Thus anyone behind you is "at your six."
Watch out, dude. There's a creep comin' up behind you but I got your six.
by aithros October 05, 2005