tv. look behind you (where there may be danger). (See also on your six. Refers to six o'clock as being behind one, as if one were facing twelve o'clock.) : Check your six, bud. Some gangsta's getting close to your wallet.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
Cite This Source