A move performed by a Bianca, in which they turn their head in a quick manner and ignore the existence of another person. Can also be defined as rejection or dismissal of someone by treating them as unimportant.
1. I thought I was doing really well with this girl I met at the bar, but then she gave me the Bianca Brush-Off
2.
Guy - What did you say to that girl?
Guy 2 - Nothing, I just gave her the Bianca Brush-Off