Periodic Ass Check. A word that all girls should know. It is when you causally ask your friend, sister, or mom to check the back of your pants to make sure you didn't bleed through while you're on or in case you got your period. Calling it PAC makes asking this more subtle, and easier to find out if this happened.
Girl: Yo can you PAC me when I stand up?
Friend: You're good / go to the bathroom I'm behind you go go go
Girl: Thanks/ Oh shit
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