look up any word, like cunt:

1 definition by AntonioH

 
1.
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
9 3