The sexual event entailing two men placing their testicles in another person's mouth and slapping the shaft of their penis's off the face of the reciever.
Chad and Mikey made my face hurt with their Quad Ball Slap Fest Extravaganza!
by QUAD BALLER August 23, 2010
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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
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Slap Olie b day

It is the day on January the 28th where you slap someone who there first name is olie and second name starts with a b
Person 1: hey its slap olie b day 'slaps olie b'
by Yourmumlikesbiden January 28, 2022
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Slap ass year 2020!

Next year (2020) are you allowed to slap everyone on the ass whenever you want to, thru the whole year!
Kåre: Baloo it is year 2020... you know what that means..
Baloo: no?
Kåre: *Slaps Baloo ass* Happy slap ass year 2020!!!
by Fjellet69 October 29, 2019
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Slap your short friend

A day that’s shouldn’t exist, now that I’ve gotten your attention, as a member of the short people committee this day shouldn’t exist. Thank you very much.
Friend1:It’s national slap your short friend today
Friend2:This day shouldn’t even exist
by 123456789butt December 01, 2020
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