June 21st. The day when u and your best friend get in bed and you know..fuck
"OMG WHY ARE U TAKING OFF YOUR CLOTHES?!!?!"

"Its National Fuck your best friend day!!! Get on the bed"
by Im_gay_for_the_egg June 20, 2021
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September 22nd is now national fuck your best friend day You can go up to a friend and ask do they wanna fuck or something
National fuck your best friend day means you are able to fuck your bestie for the whole day of september 22 aka a whole 24hrs
by mha characters are hot September 15, 2021
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Help celebrate a picture of the person that made your life better!
National post a pic of your best friend day, means to take time out of your day to appreciate what your best friend has done for you
by Kenken1156 August 03, 2021
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Slap your friends day

*Slaps a friend*
Friend:What was that for?
You: dumbass it's may 5th known as slap your friends day!
Friend: Oh no!
by Your_mum_ishot April 24, 2022
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On January 23 you can annoy your friends whenever and however you'd like!
"why have you been annoying me the whole day!?"
"Well bc it's National annoy your friend day!"
by LpveherP January 23, 2023
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national fuck your friends day. today you find your closest most trusted friends and have sex with them.
(one person) wow today is national fuck your friends day -june 26th. I guess we have to have sex now.

overruled if the person(s) decide to strip 4 articles of clothing voted by the majority instead for 5 minutes.
by sexytime696969696969 June 26, 2021
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-Hey man u wanna have a three hour anal session?

-Yeah sure bro!

Anal session with your friend
by Anal_session_4life August 05, 2022
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