Top Definition
An event at Universal studios Hollywood/Orlando,and it happens every year on September 21.

They also have an awesome show called Bill and Ted's Excellent Adventure.
Person 1: Hey have you heard of Halloween Horror Nights?...
Person 2: YES,I heard it's extremely scary!!
--
Person 1: I'm thinking about going to Halloween Horror Nights
Person 2: Bring some under wears.
by deadend September 12, 2012

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