Ms. PeriodPants Share definition Flag When a girl is hateful.(on her period) Everyone knows when Gracie is on her period, she's hateful. That's why we call her Ms. PeriodPants. Ms. PeriodPants by YAYUS MY WITTLE BABBEY CAKES March 11, 2017 0 0 Get merch Get the Ms. PeriodPants mug. Buy Now — $32.95 See more merch