He seems to have written his memoirs mainly so that he can 'dish the dirt' on all his former lovers.
The police 'struck pay dirt' when a witness came forward with new information.
The band 'hit pay dirt' [=had a big success] with their first single.
(..) Okay, Okay. Bebby? l mean, Bobby? I found a little pine cone. Shut up. - Shut up. Shut up. - Bobby, I found some dirt! Shut up. I found some dirt! Here he comes. Come on. Who sent you? (..)1992 Twin Peaks: Fire Walk with Me
(..) you sat down to dinner, did you? Let me see. Dad. These hands are filthy. Look. There's dirt way under this fingernail. - Leland, what are you doing? - Look at this finger, here. Laura did not wash her hands before dinner. (..)1992 Twin Peaks: Fire Walk with Me