I'm hatin' it - A loud, angry, and very unimpressed way of saying you’re not

A loud, angry, and very unimpressed way of saying you’re not happy and you're definitely not impressed.

I'm hatin' it, my dog chewed my backpack and it's now a sad, broken thing.

I'm hatin' it, I tried to be cool and it didn’t work.

I'm hatin' it, my best friend is being mean and I don’t know why.