Top Definition
Created by Dmitriy, Marc, Mike, and Raffy, this word was decided upon to represent the action of multiple people ("Cluster") ejaculating ("Busting") onto one single victim.
Hey, we're going to clusterbust Ms. Calandrino after school today, are you in?

Jane is so angry that those guys clusterbusted her.
by Mike/Bill November 29, 2004
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