The answer to 'why is my outlet buzzing noise' is that a buzzing or humming sound from an electrical outlet is typically caused by an issue with the wiring or the device plugged into the outlet. This can be a sign of an electrical problem that requires professional attention.
Common causes include loose or faulty wiring, a problem with the grounding, or an issue with the appliance or device plugged into the outlet. It's important to address a buzzing outlet promptly, as it can be a fire hazard. If the buzzing is accompanied by sparks, smoke, or heat, shut off power to the outlet immediately and contact an electrician.