Refering to police officers [po-po],[pigs],[five-o] ect. The old style six shot police .357 magnum or the like in a holster, hence the bullets are six in quanity and facing down.
> Six-down fool, run!

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ABBYY
absorption of sound
Adhoi
adjustable mold
AESP
agadina stimpsoni
annealing glass
autodiastyly
balanitoside
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black goggles
body wraps
border belt
braches
brake latch spring
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