Verb - for a black male to have sex with a female of another race, specifically white females. A highly racist and derogatory term.
White Guy 1: Yo, I'm going to hook up with Cindy tonight.
White Guy 2: You don't want to do that dude. Marcus black-snaked her last week.
White Guy 1: Cindy was black-snaked by Marcus? That shit is ruined now.
1. An anal pillaging in prison or otherwise, normally perpetrated by a black man with a large penis, or a white man with an abnormally large penis.
(Highly racist and derogatory)
Prisoner 1: Jeff got black-snaked by Lequan. His ass is completely tore up!!