An occasion like Hallowe'en, April Fool's, or Father's/Mother's Day. Though not categorized as an official holiday, is often used as a good occasion to get a good drunk on with friends.
" Shit dude! It's Hallowe'en, my favorite alcoholiday! Let's get done up as Zombies and get druuuuunk!!!"
A protracted happy party in which large quantities of alcohol are consumed. It can also be used while at a bar. Basically, if you're piss-drunk, you've had an alcoholiday.
I'm taking an alcoholiday, or I need an alcoholiday.
Alcoholiday is the last day of Daylight Savings Time, in the US, where the clocks are set back an hour from 2am to 1am and the bars stay open for one extra inebriation-enabling hour.
Hey Joe, you gonna have beers or Zimas for your Alcoholiday this year?