I teach a high-school equivalency test prep class for adults who didn't finish high school. Recently, I was reading over a student's essay in which she used "it is what it is". I'm so sick of hearing this empty, vague bit of bullshit that I circled the phrase and replied:
WHAT is what WHAT is?.

I know that my response was just as vague and unhelpful as this bit of trite street wisdom has become. I just wish that someone, anyone, would have the courage to step out from behind these empty words and state clearly what the "it" is that he or she is talking about.

Otherwise, they can shove "it" up their ass(es).