'All' refers to everything, and 'out' is an intensifier. So 'all-out' means 'everything and more'.
2) Captain Barne's final act was to order an all-out assault on the fortress.
The group released their first single "Timebomb" in 2008, it didn't get much success. But they kept trying anyway, they then released their first album, "The Get Down", followed by their single, "Lights". Summer of 2010, They released their free mixtape, "All Out Everything" Which has had more success than The Get Down did, but it still hasn't made it big.
The duo is reported to be releasing album #3 in the summer of 2011.
All Out consists of Matt McCormick and Joe Skutnik.
Person 2: "You should check out All Out, they have free music available, and their style is similar to the groups you like."
PUT YOUR A.O's UP!!!