A sexual position similar to Doggystyle, but you lift her legs off the ground. Then you stand, forcing her body to be arranged at a downward angle. It is named for the resemblence of a construction worker pounding away on a jackhammer
Jim: Can we go fr Doggy tonight?
Alicia: Doggy is getting boring, lets mix it up, JACKHAMMER ME!!
Jim: Who's your daddy bitch
by Smizzles fo Rizzles September 18, 2007
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the sexual act of a man repeatitively penetrating a woman's entry hole with rapid up and down movements similiar to that of a jackhammer
Alex jackhammered Jody so hard that she could not walk the next day.
by Megan and Katie September 19, 2005
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when you fist a girls vagina and ass vigorously
billy was having a good time giving the jackhammer to kimmy until her dad walked in.
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A powerful gun with a big kick-back that would act like a jackhammer in your hand
Coming hard with the jackhammers
by RDE45 April 11, 2008
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1. A sexual manuver of constant re-penetration; basically taking the dick in an out of the vagina (or anus) repeatedly, in a 'jackhammer'-like motion / or jacking off on a chick's face from a really short distance away

2. a prototype 'automatic' shotgun (worked with a feeding mechanism much like a revolver), was designed by John Andersen, it fires 12 gauge rounds, in a 10 shot 'magazine', has a ROF of approximately 4 shots per second. These are not really in any form of production
" Dude, I jackhammered pretty good her last night, she can barely walk now"
by LarryVR March 23, 2006
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sex move in which - holding chick’s ankles as man is standing up and chick dangles with shoulders resting on ground or lower surface
by JBut November 25, 2007
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1. A large power drill used in construction

2. the act of stealing your buddies hammer after he helped you build that extension for your house.
He beat Jim over the head with a jackhammer
by Seph Infinitum February 16, 2009
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