von Mann zu Mann in English: in private and in total honesty (of two men; sometimes used to indicate that the person is familiar with the matter at hand, especially if concerning male topics)

Meanings

idiomaticin private and in total honesty (of two men; sometimes used to indicate that the person is familiar with the matter at hand, especially if concerning male topics)
Von Mann zu Mann, es wird nicht besser.To be completely honest, it won't get any better.
Used other than figuratively or idiomatically: see von, Mann, zu.