no panty day
girl 1: do you know what day it is  *girl 2 pulls up skirt*  girs 1 & 2: no panty day
on the 22nd of june every year girls are required to wear no pants for the whole day
"girl 1: do you know what day it is  *girl 2 pulls up skirt*  girs 1 & 2: no panty day" What is the definition of "no panty day"?