A Legacy Prequel filth-y adj. filth-i-er, filth-i-est 1. Covered or smeared with filth; disgustingly dirty. 2. Obscene or offensive. 3. Vile; dirty. adv. filth-y 1. To an extreme and often disgusting extent. Newly released from prison after serving a three-year term, Johnathan Marcello just wants to get his head straight, but he's the only one who believes he can do it. Stepping into her mother's shoes is the very last thing on Catherine Marcello's mind, but it's already too late and she's got her own games to play. The spotlight wasn't in Andino Marcello's plan, but the Capo might not be...