If a room is abuzz, it's full of noise and chatter. An elementary school classroom is bound to be abuzz on the last day of school before summer.
When a place is abuzz, it's bustling with activity and sounds, humming in a way that resembles the buzzing of bees. The whole town might be abuzz with excitement about a movie being filmed there, or your house could be abuzz with excited children during a birthday party. Charles Dickens is credited with the first written use of this adjective, in his 1859 novel "A Tale of Two Cities."