December 18th its National slap your siblings day whether you have one sibling or 5 and your parents can get mad about it!
Mom:WHY DID YOU SLAP *insert siblings name*

Child: It's December 18th, National slap your siblings day

Mom: What-
by Gachafro December 7, 2021
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A national holiday where you can slap your siblings! It’s a wonderful day.
“Hey, sister.”
“Hey, what’s up
“Happy national slap your sibling day!”
“Wha-“
*slaps*
by yourveryownmother October 28, 2020
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When it hits the 16th of November, don't forget about "National Slap Your Sibling Day".

Stepsiblings included.
Have a slapping time on the 16th! A day to mark in your calendar.
"Ow, why did you hit me?"
"It's National Slap Your Sibling Day!"
by UrbanWriter123 November 16, 2021
Get the National slap your sibling day mug.
When it hits the 16th of November, don't forget about "National Slap Your Sibling Day".

Stepsiblings included.
Have a slapping time on the 16th! A day to mark in your calendar.
"Ow, why did you hit me?"
"It's National Slap Your Sibling Day!"
by UrbanWriter123 November 16, 2021
Get the National slap your sibling day mug.
A day where you get to slap your sibling(s) free of charge.

Active December 5th through 10th
Hey (Sibling) Its National Slap Your Siblings Day.

National Slap Your Siblings Day- A day where you get to slap your sibling(s) free of charge.
by otis wotis December 6, 2021
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