info-dump

Short definition from Wiktionary

Noun

1. 1
   A large volume of data supplied at the same time.
2. 2
   A long section in a work of fiction that reveals often tedious expository information through the voice of the narrator.
3. 3
   An act of sharing a large amount of information on a subject one is interested in, particularly as an activity by or among autistic people.

Verb

1. 1
   To speak expositorily and at length regarding one's knowledge about a subject.