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Serio 10

Serio is a solemn oath of absolute truth and loyalty used among close friends — a verbal contract that what you’re saying is real and must be believed. Serio 10 is the elevated, unbreakable version of that oath. It’s the equivalent of saying “I swear to God,” but on a deeper, more sacred level — a level 10 declaration of truth that cannot be taken lightly.

Once “Serio 10” is invoked, the statement must be 100% true — no exaggeration, no trolling, no lies. Breaking a Serio 10 is considered “abuse”, and doing so severely damages your credibility within the group.

Breaking it once leads to a loss of trust. Repeated violations result in social devaluation, exclusion, and eventual ostracization. Within this code, Serio 10 is sacred — if you use it, you better mean it.

Think of it as a verbal blood pact. You either honor it, or you’re done.
A: “Bro, I didn’t hook up with her. I swear.”
B: “Don’t play with me. Serio 10?”
A: “Serio 10.”
B: “Alright then. I believe you.”

... Later B discovers that A didnt actually hook up with her

B: "Abuse. Straight abuse. You're done."
by bmankobe August 22, 2025
mugGet the Serio 10mug.

mermaidations 5:10

mermaidations 5:10 “thou must watcheth h2o”

-made by @aqua the dino
You’re a sinner, have you not read “mermaidations 5:10”? “thou must watcheth h2o”
by Aqua <3 February 1, 2023
mugGet the mermaidations 5:10mug.

-10

You just lost a lot of blood over what the -10 did.
by Solid Mantis November 15, 2019
mugGet the -10mug.

April 10

It’s national fuck a celebrity day! Harry Styles wya?
I had intercourse with Sebastian Stan on April 10.”
by Thea Zoeitz April 10, 2021
mugGet the April 10mug.

November 10

it's u/kirbo5000 day :)
Person A: hey, it's november 10

Person B: NO WAY ITS U/KIRBO5000 DAY!!!

Person A: what the fuck
by almond milk enjoyer November 10, 2021
mugGet the November 10mug.

10 finger dunk

After you’ve used all 10 of your fingers to get a single woman to climax
Jane glowed and exclaimed “Tom gave me the 10 finger dunk and knocked the cobwebs out last night.”
by Tomandjane September 26, 2021
mugGet the 10 finger dunkmug.

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