On the 10th of August, after National Slap Your Brother Day, is National Slap Your sister day. It is a day where you, as it says in the title, a day to slap your female siblings.
by EpicCommie August 9, 2021
Get the National Slap Your Sister Daymug. "Treating your girlfriend like your sister" When one treats his girlfriend as he would treat his sister with care and respect!
by Monstercock January 6, 2021
Get the Treat your girlfriend like your sistermug. 
Get the incest is the best put your sister to the testmug. Question to be made when you feel treated unfairly, made responsible for something you didn´t do, or ordered to do something you feel not responsible for.
by rperazag June 16, 2010
Get the did i kill your sister or something?mug. by devoted christian November 2, 2020
Get the national punch your sister across the face daymug. Ian you kiss your sisters cat with that mouth: It means when a guy like **Ian** Kisses a cat that belongs to his sister.
by #BecomeAPlayerToday March 30, 2021
Get the Ian you kiss your sisters cat with that mouthmug. Jeff: what you doing today bro?
Bro: What do you think it’s National Threesome with your Sister and Mom day
Bro: What do you think it’s National Threesome with your Sister and Mom day
by Hikari 𓆏#696 October 14, 2021
Get the National Threesome with your Sister and Mom daymug.