this comes from the ancient folk lore about the black man who would have sexual intercourse with his mother after a long day of hunting. he would always finish the load in his mothers bum when the sentence "black fuck incest would cum in my ass" uttered from his mothers lips. you would normally use it to describe a black man coming home with a food stamp who is so horny that he would fuck his own mother.
White man: "Hi buddy, let's go collect the monthly food stamps!"
Black man: "Cuuhhh, I already got it cuuuuhh. This is a good time for black fuck incest would cum in my ass and marijuana!"
The act of sexual pleasure by eating cum and shit in a sandwich and fucking a rhino and licking balls and screaming cum on my monkey dick pls harder daddy fuck me like a fat ass rhino.
bananas monkey cum in my asshole in shit in my mouthpls daddy.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi