"It is what it is".

Well no fucking shit. What else would it be? I feel like this is a method of analysis for lazy or apathetic people. While some things may not need much explanation, that's usually not how the phrase is used. It's usually used when someone can't quite figure out what's going on.

Blue Sky Thinking

Refers to unconstrained brainstorming, which often feels disconnected from reality.

I once worked for an organisation which had painted and removed furniture from an otherwise perfectly good meeting room to turn it into a blue sky thinking room.  the paint scheme was a blue sky. i never saw anyone in the room. 

“67”. I don’t know where is started, and I know it’s kids that do it, which I don’t mind (we did the bud one at the same age “wasssup”) but when a 40 year old bloke does it, name fuck of mate. 

"It is what it is" used to drive me crazy. I think it's a local thing in the area I live in now. The first time I heard it I just stood there with a dumb look on my face thinking the guy was going to elaborate, but it never came.  I decided it was a lazy person's way of not having to think too hard to articulate an explanation for something.