Definitions of buzz:

• noun:   a confusion of activity and gossip

  Example: "The buzz of excitement was so great that a formal denial was issued"

• noun:   sound of rapid vibration

  Example: "The buzz of a bumble bee"

• verb:   make a buzzing sound

  Example: "Bees were buzzing around the hive"

• verb:   call with a buzzer

  Example: "He buzzed the servant"

• verb:   fly low

  Example: "Planes buzzed the crowds in the square"

• verb:   be noisy with activity

  Example: "This office is buzzing with activity"