buzz

n. 1 hum of a bee etc. 2 sound of a buzzer. 3 a low murmur as of conversation. B stir; hurried activity (buzz of excitement). 4 slang telephone call. 5 slang thrill. v. 1 hum. 2 a summon with a buzzer. B slang telephone. 3 a (often foll. By about) move busily. B (of a place) appear busy or full of excitement.  buzz off slang go or hurry away. [imitative]

v. i. To make a low, continuous, humming or sibilant sound, like that made by bees with their wings. Hence: To utter a murmuring sound; to speak with a low, humming voice.