An act involving 2 or more persons(works best with 5 or more) in which the people involved get naked, and then proceed to "buzz" their lips in the asshole of another in an energetic fashion, until all members reach climax from the anal stimulation. The process works best by forming either a long chain or circle. Depending on the participants involved, the "buzzing" may start becoming rhythmic and melodious in nature and will thus enhance the pleasure and intensity of climax of the group ten fold.
John: I was with the quintet the other day, and we decided to have a vivace together.
Frank: I love a good vivace!
John: Ya we've never all been in rhythm like that before, It was amazing!