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1.
a penis, usually 7-9 inches in length and rather thick, taken from the African American folk hero John Henry, who packed a wallop with both his trusty sledge hammer while working on the rail ways and his own mighty John Henry... as the ladies of the 1800's so fondly put it
"Wow! Look at Sean's John Henry... it's massive!"

"Put John Henry in me... or at least as much of him as you can"
by grifbassking November 17, 2007
 
2.
A John Henry is a sexual move in which you lift a woman with double under hooks, with your elbow pit cradling her knee pit. Clasp your hands in a gable grip for maximum effect.

You then pump the shit out of her as if you were pounding railroad stakes into the ground trying to beat a steam powered machine.

From the root words John, which means "to pound"; And Henry, which is latin for "in her moist pussy."
"I took that bitch home from the bar and gave her the ole John Henry. It blew her Fucking mind.", said the man.
by B-razle June 14, 2010
 
3.
A term used to describe a mostly smoked or nearly empty bowl of marijuana. Often shortened to "JH."
"Gross. That was a total John Henry hit."
by Bazzy_J February 12, 2009
 
4.
A very famous celebrity.
Has gone under many disguises including Chuck Norris, Mr T., Donald Trump, Both Olsen Twins, Sylvester Stallone, Hulk Hogan, and the Maid from the Brady Bunch. Some of his most spectacular feats include PKing Zezima, outsmarting the VNS, turning blood into water, walking on water, and being soley responsible for the Fallador massacre using his 1337 H4x0r skillz.
unknown to most, John Henry is Chris Angel's stunt double
by Juice Springstein November 09, 2007
 
5.
A persons given name, most commonly used when discussing a signature.
Sign your John Henry down here.
by Haz Nomis August 20, 2008