To deliberately and selfishly divulge information about a coworker for the sole purpose of gaining an upper hand on said coworker to an authoritative third party (i.e. the boss).
Jordan: “Matt, can you believe what Fisher did?”
Matt: “What did he do now?"
Jordan: “I was only 5 minutes late, FJ was not in the office yet and had no idea i was late, then Fisher completely bus drove me by telling FJ i was late to work!”
Matt: “Yeah Fisher is such a fucking BUS DRIVER!”