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1.
The aftermath of a drinking party, usually resulting in every available horizontal surface being covered in empty booze containers, spilled beverages, and a general sticky alcoholic residue.
You guys better stay around to help clean up the alcoholocaust you started last night.
by Esche December 10, 2004
 
2.
What occurs at a drinking party when everyone drinks so fucking much that they all pass out and fall on the floor and/or on top of each other.
Last night's Roman orgy of a slumber party ended when everybody(guy and girl, clothed and naked) passed out on top of each other in a mass alcoholocaust.

Then the next morning when I woke up and while everybody was getting dressed and leaving, I found out that my face got all bloody when one of the cheese hog bitches fell on top of my face, breaking my nose!
by Mark H September 04, 2004
 
3.
Continued days of drinking. Three, Four, Five and onwards. Continued drinking for many many days.
Wayne and Steve went to the footy the other day and it ended up being an Alcoholocaust. They keep going for the rest of the week.
by Wangstereo March 31, 2011
 
4.
An event, usually taking place in a bro cave or other established bro lair, in which bros consume massive amounts of alcohol and get plastered. Typically accompanied by food, TV and confidential discussions of a bro-nature.
Bro 1: Bro, I'm sort of bored want to invite everyone over and have an alcoholocaust tonight?
by veryfresh123 August 16, 2012
 
5.
noun. a period in time when alcohol was shunned.
"Did you go Baptist Betty's party last Friday? Man, it was really the alcholocaust!"
by T.W. February 09, 2004