A state of extreme inebriation leading to public embarrassment of one's self and one's friends.
Derived from the historical incidents involving mixed African-American and white people in the United States where neither race would claim their membership. In this case, no one will claim someone who is half black drunk.
"I just got back from the liquor store with a handle of whiskey and some peach schnapps. My girlfriend's going to be so pissed when she sees me half black tonight."