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A sex position when you hold a girl upside down and spread her legs to resemble the handles of a jackhammer while doing this you pound your penis in the girls vagina causing her to go up and down like a jackhammer
I did The Jackhammer last night
by AntonioH June 16, 2012
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
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.
by the jackhammer professor May 05, 2009
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3
Created after the orginal thought of the drill, the jackhammer takes speed and power in order to work. Start by creating a fist. Then, get into a stance that will allow maximum power and speed. Arch your back forward and thrust your fist through your other hand, in some what of a punching motion. Try to build up speed. That is the secret of the Jackhammer. Kids, don't try this with grandma in the room.
"Your Drill's got nothing on my Jackhammer"

"Why don't we just stick the Jackhammer in with all the other tool techniques."

"I hope you're proud. Damn you drill and Jackhammer!"
by Daikirai July 13, 2006
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4
This is the sexual act of a male using quick, hard pumps to penetrate and conquer any orafice.
My girlfriend's mom told me that her butt felt like broken concrete after I gave her the jackhammer.
by Nathan Warnock July 20, 2006
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