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.
Me:"It's National Slap Your Sister Day"
My sister: Shit...
by EpicCommie August 9, 2021
Get the National Slap Your Sister Day mug.
It’s when you fucking destroy your sister cause she’s a little prick.
“Ima fucking upper cut the shit outta you Stephanie”

“Why?”
Cause it’s National uppercut your sister day
by MexiAlan October 30, 2019
Get the National uppercut Your sister day mug.
National punch your sister day is every February 20th, where you can punch your sister all day long
Today is national punch your sister day
by Alyankees12 February 20, 2023
Get the national punch your sister day mug.