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.
(..) To make soap, first we render fat. The salt balance has to be just right so the best fat for soap comes from humans. - Wait, what is this place? - A liposuction clinic. Pay dirt! Richest, creamiest fat in the world. Fat of the land! No! Don't pull it, don't pull it! - Oh, God! (..)1999 Fight Club