(onom.) buzz; drone; hum

All that time the things granddad had said, like the sound of flies flying round a melon, buzzed in my head.

The buzzing of the bees makes me a little nervous.

Commentators have variously described the sound of vuvuzelas as "annoying" and "satanic" and compared it with "a stampede of noisy elephants", "a deafening swarm of locusts", "a goat on the way to slaughter", "a giant hive full of very angry bees", and "a duck on speed".

Did you know that if you plug a pickle into an electrical outlet, it glows and makes buzzing noises?