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 come in with me. - Nice. - It is fucking great. Conway. You bring your pay slips? Four and a half months of dirt. - It is so good. - I did it. - Do you love it? - It is wonderful. This we had to have made special. (..)1990 Goodfellas