I know the look... but, could you just, with your own words tell us how do you feel the look? Describe it for us just for the entertainment 
It's instinctual man...You just know...
Let's say the wife and I were out on the town for dinner and movie. We finish dinner and we're walking down the street hand in hand...Me in all of my chocolateness and my little blonde hair, blue eyed German wife....We are enjoying the walk when off into the distance, I see a group of black females coming our way.
Now at this point you have to think ahead because this could end really bad if you're not careful...lol
You can A. let them walk by and you greet them like you would anyone else. B. Cross the street like they're a bunch of muggers
C. Let them approach but ensure you are locked and loaded for the onslaught D. Let them approach but don't make any eye contact.
In 12 years of being married. The only openly racial problems I've had, have been with black women...Not white men, white women or black men, BLACK WOMEN!
In most cases to protect my wife and myself, I'd go option C... This was later in my marriage after I found out the hard way.
The look can only be described as a stare of anger and disappointment on their part...Example:" What? We aint good enough for you? Sorry ass n*gga, you aint shit. Take your skinny little white bitch, you still a sorry n*igga."
All of this while looking you up and down...This is the worse of situations...This has never happened to me and if it did, the bitch would be in the hospital and I'd be in prison...Thank God...The look sucks...but I always have my pimp hand ready. I'm sure there's alot of psychologocal rage stored up towards these women and I'm sure upon encountering me, they can probably feel it...It's sad, but it's the truth.