Nigga Biscuits occur when you pull your dick out of a chick's ass and it is completely covered in noxious filthy shit.
Once the smell hits, everyone within 200 feet starts to puke.
Phred: "Dude! WTF happened to you last night?"
Me: "Well, we were in bed and I was just jackhammering her asshole, but then I slipped out, and I had Nigga Biscuits on my dick. First she threw up, and that made me puke. Homey upstairs hurled, and it caused his wife to spew. She spewed out the window, and a little bit of it came back down in my window, so I puked again."