When a man grips his penis with both hands, fist over fist (requires substantially sized penis), and then has the partner grasp both of his forearms and create a motion similar to that of a jackhammer. A variation can be done by a woman holding a dildo.
Dude, that chick was crazy, she hopped on top and gave me the jackhander!
by Jackman17 July 25, 2012
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