BIFF (starting left for the stairs.): Oh, Jesus, I’m going to sleep!
WILLY (calling after him): Don’t curse in this house!
BIFF (turning): Since when did you get so clean?
– Arthur Miller
Death of a Salesman, Act 1. Biff has lost complete respect for his father, as evidenced by this exchange between son and father. Willy admonishes Biff for cursing and Biff responds by suggesting that his father is far from lily white. He is referring to Willy’s betrayal of Linda by his affair with The Woman.