look up any word, like dirty sanchez:
 
1.
a black environment, or enclosed space in which nothing is visible. Places or things that are very, very, dark or black. Without light.
When the lights went out in the storm the whole house was as black as a nigger's pocket.
"The moonless night was as black as a nigger's pocket".
You could also say, "as dark as"
by bamagrad April 15, 2009