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Refers to a male individual having the last name of bach or bach contained within, who possess an enormous penis. Similar to the loch ness monster, the bachness monster is characteristic of an unusually large, cylindrical organ.
"Dude, last night I gave her the bachness monster."
or
"Fuck man, how am I supposed to bang her out with the bachness monster here?"
by Steve Bach February 08, 2008
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