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SISY (Sig Incompetency Syndrome Yahoo):
A derogatory acronym for individuals who falsely claim that their Sig P320 or P365 self-discharged, when in fact the discharge was likely due to user error, unsafe modifications, or ignorance of proper firearm handling and maintenance.
• “That guy who says his P365 went off in the holster? Classic case of SISY.”
• “Before blaming the gun, maybe check for SISY syndrome first.”
• “SISY isn’t a malfunction—it’s a malfunction between the ears.”
SISY by BobSolo July 26, 2025

Sisyphus Prime 

The main boss of P-2 Wait of the world in the game Ultrakill, known for the reputation of constantly whooping the player's ass and giving them thoughts to quit. for more information check the actual Ultrakill Wiki
"what's the boss that come after minos prime?"
"sisyphus prime."
A kannada word used genarally to address someone casually in bangalore (the silicon vally of india) - friends, classmates etc.
A: hey sisya whats up..

B: Going ok man this but these assignments suck...
sisya by vinky November 22, 2007
A person or object doing something that is seen as futile and repetitive, usually taking a long time to finally get the satisfaction of completion. The term is in reference to the Greek myth of Sisyphus, who is punished by being forced to roll a boulder up a mountain, only for the boulder to fall back once nearing the top.
A: "I just finished my work and then my boss gave me more to do."
B: "Wow, you are exactly like Sisyphus."
sisyphus by mrmacandchester July 29, 2023

sisyphus edging

Edging until the end of time (or for an extreme amount of time).
A: I did sisyphus edging for the entirety of No Nut November.
B: Gee willikers, how do you not have cock burn?
sisyphus edging by hubertg October 15, 2020

Sisyphean 

A task that no matter the effort has not outcome.
A sisyphean task is similar to trying to define all the prime numbers.
Sisyphean by Spanishblau August 19, 2019