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an expression of aggression, forth rightness, efficiency, and extreme attention to detail in getting something done. a popular phrase for sergeants that was coined by Marine Light Attack Helicopter Squadron 303 Airframes and later spread to Marine Light Attack Helicopter Squadron 267 Airframes division. Hammer Down serves as an adjective in the sense of describing the expiditious, dominant manner an activity is conducted or as a stand alone verb such as A) laying the fuck into somebody. B) getting shit the fuck done C) regulating on bitches like a mofo.
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