New York slang to describe that inexplicable feeling that you feel when something is doing the opposite of what you would like it to do. "Pissing me off" is too aggressive something that is blowing yours and and saying "this situation is annoying me" doesn't sound as cool.
This 9am class is blowing mine. I hate waking up early.
The fact that I have to take the bus now is blowing mine, I need to get a new car.
All of these young people at this party are blowing mine. Let's go find a place that has people our own age.