too much information

Short definition from Wiktionary

Interjection

1. 1
   An expression indicating that someone has revealed information that is too personal and made the listener or reader uncomfortable.
2. 2
   An expression indicating that someone has imparted an excessive amount of information that cannot be processed in a short amount of time.
3. 3
   Introduces an expansion of a short answer with additional information that may be extraneous or unnecessary, hinting that it can be ignored if the short answer was sufficient.