What is black snake in gay porn?

What is black snake?

Gay slang or terminology for a man's penis, who is of dark skin color. In short a black man's penis.

Definition

Rightly or wrongly, many associate Black males with having larger than average penises. The connection of a large snake to describe the appendage is quite normal, when talking about long dicks.

Adding black to the common term, snake, is to denote the skin color of the owner.