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A very naughty girl with a huge hole that ANYTHING Can Fit In(LIterally)
"Damn that mf got clapped by akaza"
"He Must Be A Rengoku"
Rengoku by JerrySucksToes August 14, 2023
Noun: a sex act where a person reenacts the scene from Kimetsu no Yaiba involving Rengoku’s death by painting their fist white and blue like Akaza's and fisting their partner
I met up with a weeb last night, and she was cute so I gave her a Rengoku
Rengoku by Silverrrrrr January 27, 2024
The surname of "Kyōjurō Rengoku", the hero who failed, the Flame Hashira.

The 9th form of Flame breathing is not to be mistaken with "fire" or "sun" breathing, the strongest and most dangerous technique for both the user and enemies due to leaving the user of this 9th form completely open after the strike, and the enemy due to it having all the force of the user.

The name "Rengoku" for the 9th form is the Japanese name for the 9th form, while the English name being called purgatory, ironically or coincidentally the early translations for the manga also used the name "purgatory" for the last and strongest move, the 9th form.
"Flame breathing, nineth form! RENGOKU!"
Rengoku by SomeDudeWithEnglish February 28, 2024
A donut that can use a fire sword (kakyoin) better lol
AHHHHH!rengoku died 😭DONUT
Rengoku by Khan Ye January 8, 2025

Rengoku donut

Rengoku donut is a way of making fun of Rengoku from Kimetsu no Yaiba/Demon slayer since he got punched in the heart by Akaza, and it left a round hole like a donut
Someone:OMG I CRIED SO MUCH WHEN RENGOKU DIED😭. Someone's freind: RENGOKU DONUT LOL🤪. someone: FUCK YOU
Rengoku donut by Harahara March 12, 2022

Rengoku Kyojuro 

The most finest and beautiful-est person in the anime demon slayer and of all the anime there is in existence. He is my most beloved and soulmate idc what y'all would say, he is mine.
Person : do you know who Rengoku Kyojuro is?
Me : My husband