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1.
HHN
Halloween Horror Nights. An event held at both Universal Studios Hollywood and Universal Studios Orlando. The event started off as "Fright Nights" back in 1990 and has become the countries' biggest Halloween event. Halloween Horror Nights is held in the last week of September till the end of October, more recently going 1 day into November. It runs from Wed-Sun.
Let's go to HHN to get the shit scared out of us!
by TourettesGuy4Ever May 25, 2008
 
2.
hhn
An short way to say Halloween horror nights . This is an halloween event that is at Universal orlando
HHN is always Talked about At Group like Chainsawwolf@yahoogroups.com or HHNvault.com
by Jack The pumpkin King July 19, 2006