When a man spreads the woman's vagina flaps and attempts to stick his head into it. This normally ends up with a trip to the ER as it is not safe for both genders. This can be done with the same sex (see Finnish jackhammer).
Brian: "so I gave Sandra the Estonian jackhammer last night!"
Andre: "is she ok?!?"
by The isis November 13, 2014
Get the The Estonian jackhammer mug.
When you eat pop rocks and give someone a blowjob at the same time
Dude, I just got a San Diego Jackhammer
by Jackdimmadomeee July 28, 2018
Get the San Diego Jackhammer mug.
When a petite girl riding you and you start lifting them up and down with extended arms.
I took this tiny girl home and we did the Petite Jackhammer.
by AgentPistol February 16, 2018
Get the Petite Jackhammer mug.
A sexual position. Similar to the pile driver. One standing partner holds another partner, by the hips, while second partner is standing on their head, legs spread in a T shape. Standing partner is generally a male since insertion of the sexual organ is a prerequisite for completing the position, but First partner may be a female wearing a strap-on. (though this may evolve to its own new position) -----First partner, with firm grip on second partners hips, and with sexual organ (or facsimile) fully inserted, (orifice of insertion depends upon sex of second partner, as either sex is possible, though a women presents more possibilities) pretends that second partner is a jackhammer (making Jackhammer noises is not required, but is suggested for authenticity) and lifts second partner, then drops, lifts, then drops, repeating this process until orgasm or boredom sets in. FOR FULL EFFECT first partner should occasionally blow hard onto the partner and smack them with snowballs to simulate the driving wind and snow of the Connecticut college town.
"Hey what did you do with that girl at Towers last night?"
"Me and Paul gave her the Storrs Jackhammer!"
by SupeDupe February 18, 2019
Get the Storrs Jackhammer mug.