A kickback is money you take for a favor that isn't legal or allowed or for being in charge of a project, organization etc. Waste management contracting from the sopranos refers to a TV show about new jersey mobsters entitled the sopranos. In the show, they use a garbage disposal corporation to launder the money they make from their racketeering schemes. Whenever the boss is asked about what job he does, he just replies with 'waste management'.