Big Girl Panties

I'm going to change the names in this. 
The principal told Betty that she had to teach a different grade level next year because the teachers on that grade weren't getting along.
Betty said that she'd taught four years with Lou who didn't get along with anybody and she just had to put on her big-girl panties and suck it up.
The next day the principal say Betty in the hall and asked if she had her big-girl panties on.
Betty said she'd spent a lot of time the night before hoping she'd said "big-girl pants."
The principal said, "No, panties!"