tell all

Short definition from Wiktionary

Verb

1. 1
   To reveal everything, particularly information that is normally withheld.
2. 2
   Used other than figuratively or idiomatically: see tell, all.

Adjective

1. 1
   Telling all; revealing everything, particularly details or information that are normally withheld.

Noun

1. 1
   A publication, usually a book or magazine article, which tells all, revealing every detail, particularly information that is normally withheld.