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A jackdhammer is when a guy goes full robot on a girl, slamming like a madman with no care in the world. It’s like he’s trying to dig a hole to China.
“That guy jackdhammered her so hard, I felt the vibrations in my couch.”, @PornCritic1
“He didn’t even let her move. Just held her like a prisoner.”, @LuvH8Luv
“I watched a guy jackdhammer a girl’s mouth like it was a job interview.”, @AntiJackhammer