noun

• (informal) A rush or feeling of energy or excitement; a feeling of slight intoxication.
  "Still feeling the buzz from the coffee, he pushed through the last of the homework."
• (informal) A telephone call or e-mail.
  "Now, don't waste time, give us a buzz -- quick! 825-4703 or 265-7881."
• (informal) Major topic of conversation; widespread rumor; information spread behind the scenes.
  "Mr. Hall? The buzz on Christian is that his parents have joint custody, so he'll be spending one semester in Chicago and one semester here."
• (uncountable) Synonym of fizz-buzz (“counting game”).

verb

• (intransitive) To make a low, continuous, humming or sibilant sound, like that made by bees with their wings.
  "Ah! the singing, fatal arrow, / Like a wasp it buzzed, and stung him [a roebuck]!"
• (intransitive) To make a low, continuous, humming or sibilant sound, like that made by bees with their wings.
  "However these disturbers of our peace / Buzz in the people's ears."
• (intransitive) To make a low, continuous, humming or sibilant sound, like that made by bees with their wings.
  "But I tell you this has set all London buzzing. The old man is where he likes to be, with a pin-point limelight right on his hairy old head."
• (intransitive) To make a low, continuous, humming or sibilant sound, like that made by bees with their wings.
  "A fly was buzzing past me."