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(noun) When a male going on a long sexless streak gets an erection around a large group of people while looking at a pretty girl, and in a fit of lust kills them all with his erect penis until he cums.
John: What happened to the Jones?

Mike: Little Billy went on a Horny Holocaust, its been weeks since he's had a date.
by Crickbertius182 June 25, 2009
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