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To be intoxicated to a level where all abilities to make rational decisions become impossible.
Matt was so jack-hammered, he did not realize the girl he slept with was 300 pounds.
by High Profile December 16, 2006
When one is so hammered (drunk) on drinking large quantiies of Jack Daniels' Whiskey that they don't even know their own name.
Good thing Ray was brought back to the motel last night by his friends, because after drinking a pint of JD he was totally jack-hammered.
by busterboner February 07, 2010
When some one utilizes thier dick as a jackhammer and pounds it against your forehead until it bleeds.
I got jackhammer dick.
by Bob Vila May 28, 2003