Top Definition
Australian music festival. A tradition, a rite of passage, a necessity to any Aussie music fan. Consistently attracts the biggest artists in the world.
Past acts have been Nirvana, Smashing Pumpkins, Hole, Korn, Metallica, The Strokes, The Prodigy, Blink 182, At The Drive-In, Foo Fighters, Queens of the Stone Age.
This year saw Beastie Boys, Slipknot, System of a Down, Chemical Brothers, The Hives, The Streets and more visit the best country in the world.
"Are you going to the Big Day Out this year?"
"Hell yes."
by me January 29, 2005
2 more definitions
The biggest, and best music festival in Australia. It tours Australia and New Zealand every year, and has some of the best music acts around. This year was the best ive been to, with The Killers, My Chemical Romance, Tool, Jet, Muse, Evermore, Eskimo Joe, The Presets, Lily Allen, Hot Chip and Sick Puppies.
The day runs from 10am till late, and features about 5 stages, so theres always someone good to listen to.
Plus, theres awesome rides and stuff if you get tired of the mosh environment!
Best day of the year!
I listened to The Killers from the top of the ferris wheel at Big day out '07. It was mad!
by Laurrr April 11, 2007
a mocking term to refer to a female who sees fit to wear a tiara on her "big day out" such as at a bachelorette party, birthday, etc.

Hey look at you "big day out"

Hey big day out "where's the party?"
by dean_man December 22, 2008

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