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3.
A serious thug] - Dedicated, professional and highly capable of "gettin' medieval on yo' ass" in highly unique and creative ways, from urban combat to hands-on work.

"I was in the Special Forces for ten years, now I do private security for the mob. Settle problems for them. I'm their number one pipe hitter."

Merc's in Iraqistan wear t-shirts that say "Pipe Hitters Union - Local 187"

Marsellus Wallace: "call a coupla pipe-hittin' niggers, who'll go to work on the homes here with a pair of pliers and a blowtorch"
by Jules - Bad Motha' December 18, 2005
 
1.
Some one or a group of people who are willing to go to the extreme in order to get things accomplished. Most commonly refers to the special forces, but is not limited to that. Can also serve as an extreme marksman(s). Someone who will accomplish any task no questions asked. It is rapidly evolving to encompass all those who live life to the extreme.
Black Water is full of pipe hitters, ready to go.
Pipe Hitters Union Creed: "Live extreme, always give one hundred percent and watch your brother's backs."
by Harry Waring March 09, 2008
 
2.
A terminology often used to categorize the elite, special operations, direct action units of the United States Military. Delta Force (CAG), SEAL Team 6 (DEVGRU), the 75th Ranger Regiment, SEALS, and some elements Special Forces groups (Green Berets) are all considered "Pipe Hitters"... Marine Force Recon kind of, sort of falls into this category also. All of these units are highly respectable, well trained, top of their branch, operators.
1) When everyone on the objective must die and no structures need be left standing, call in the "Pipe Hitters".

2) There is a definitive difference between the standard Soldier/Marine/Sailor and those who are referred to as the "Pipe Hitters" of the military.

3) Ladies, get yourself a "Pipe Hitter". Your vagina will love you for it.
by 275WatchMan7tre April 22, 2009
 
4.
the hardest, wildest, meanest and most intimidating people in any city, state, or country

Every place has men or women that are considered the biggest and badest among their group of peers. Usually the kingpin of a gang, cartel or a hottie with some big breast
Pam Anderson, John Gotti, Marceles Wallace, Ray Lewis, Ted "WuVile" Dancer
by The Wolfe January 06, 2004
 
5.
Drug addict predominately crystal meth, that will do anything for another hit or score. Including but not limited to torture and sexual favors.
'pipe hitter'

Marsellus Wallace: "call a coupla pipe-hittin' niggers, who'll go to work on the homes here with a pair of pliers and a blowtorch"
by Scenica January 28, 2011