The people who smoke crack and can therefore accomplish a difficult/dangerous/disturbing things because they only care about their next high.
Has been adopted by tier 1 special operations to refer to tough men who go the extra distance to accomplish the mission or rescue their fellow man. Doesn't really make much sense when used this way.
I'ma call a coupla hard, pipe-hittin' niggers, who'll go to work on the homes here with a pair of pliers and a blow torch. - Marcellus Wallace (Pulp Fiction)
"Just read about that Medal of Honour recipient. Absolute pipe hitter."
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An expression that often is used among friends to say fuck off or eat shit.
L: Fuck I only got a 90% on my test
J: Suck my ass
B: you got shotgun last time, it's my turn to ride in the passenger seat!
A: Suck my ass