on one's back {adj. phr.}, {informal}
Making insistent demands of you; being an annoyance or bother.
My wife has been on my back for weeks to fix the front door screen.
I can't get any work done with the children on my back from morning until night.
Jim could do a better job if his boss weren't on his back so often.
Contrast: OFF ONE'S BACK. Categories: adjective bother informal