A more modern version of 'she'll be right'. An optimistic expression used to make people feel better.
1.
Dave: "I'm really worried about the next pitch of this climb, I think Im a big girly boy."
Brendan: " Nah, no worries mate, it'll all be good"

2.
Jim:"Mate, My leg just got ripped off by a large crocidile and im bleeding to death"
Brendan: "It'll all be good, keep your chin up!"

by SWCBB September 24, 2006
Get the it'll all be good mug.