help not a hindrance
what your mother suggests you be in situations when you're causing a delay, interruption, or some degree of difficulty in her completing some routine task
Mom: I'm trying to finish grading these papers, so can you please quiet down?
Me: pffffffffffffft! fart
Mom: You know, you'd make my life a lot easier if you'd one day decide to be a help not a hindrance.
Me: pffffffffffffft! fart
Mom: You know, you'd make my life a lot easier if you'd one day decide to be a help not a hindrance.