Where Noses and Powder Go Together Implicitly

Teenage girl #1: When I was little, my mom told me that whenever I had to go to the bathroom, I should say "Excuse me, I have to go powder my nose." But when I said it to my kindergarten teachers they didn't understand what I meant.
Teenage girl #2: That's because your kindergarten teachers, unlike your mom, weren't bitchy, uptight wasps.
Teenage girl #1: Yeah, I know. That's why I go to private school now.

--Terminal 5