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1.
1. What you say when something bad happens to you but dont let it bother you
2. What you say when something bad happens to someone telling them dont let it bother you

Ob-La-Di Ob-La-Da Life goes on bra!
Guy 1 - Shit I lost a fiver
Guy 2 - Ob-La-Di Ob-La-Da Life goes on bra!
Guy - I suppose
by Jay Clarkson August 06, 2005
 
2.
If you want some fun,
sing obladi-blada.
by enjuneer December 05, 2003
 
3.
A simplified way of saying, "Life goes on". The phrase first came to be in the popular beatles song by the same name, and since then, has became an extremely common phrase in pop and youth culture.
One of the more common scenarios for using "Ob-La-Di-Ob-La-Da"

Exemplified Man #1: "Hey man, what's cracka-lackin?"
Exemplified Man #2: "My boss denied me the f@#$%ng promotion I've been wanting due to my 'repulsive hygiene'..."
Exemplified Man #1: "Well, you could always try using--"
Exemplified Man #2: "Ob-La-Di-Ob-La-Da!"
Exemplified Man #1: "Uhmm... What?"
Exemplified Man #2: "Ob-La-Di-Ob-La-Da... You know! (sings) Ob-La-Di-Ob-La-Da, life goes on, Bra---"
Exemplified Man #1: "Oh, Now I see! You are using 'Ob-La-Di-Ob-La-Da' as slang for 'life goes on'- which, everyone knows are the following lyrics in the popular, yet obnoxious Beatles tune! Such an obviously interpretable phrase should be used more often! I too, am going to begin using this phrase commonly in my speech!"
by Thehippestkidyoullevermeet July 26, 2010