Dictionary.com
definitions

nigger heaven

noun Slang: Extremely Disparaging and Offensive.
  1. peanut gallery(def 1).

Origin of nigger heaven

First recorded in 1865–70; with reference to the former segregation of black people in the balcony of theaters

Usage note

See nigger.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018