A messy, watery, loose stool that is excreted with childbirth-like pain and has a color and consistency not unlike turkey gravy.
"Don't use stall #3 - someone left behind a gravy baby and didn't flush."
A black man that supposidly isn't "black" enough for women.
This guy once told me he got rejected because the woman thought he wasn't black enough. I called him a gravy baby.