No Flush Challenge 

A challenge that a brave adventurer can partake in where the aim is to not flush their toilet for as long as they can withstand the putrid horror that will eventually build up inside the bowl.

Dinith: "Hello Wendy, by Jove, what is that horrible smell coming from your toilet?"
Wendy: "Well Dinith, I have been taking part in the No Flush Challenge for about 6 years now"

No Flush Challenge by oh yeah! yeah! February 14, 2014

No Flush Challenge 

The NFC originated in Flordia and is rarely attempted by normal people. The challenge is to not flush the toilet for as long as you can while withstanding the putrid smell and horror that will eventually build up inside the bowl.

The No Flush Challenge is real

No Flush Challenge by BestMemesNorthAmerica July 21, 2021

no lacking challenge 

some chicago goons took to social media to make people carry their fire with them at all times. they creep upon people at night or in randomsituations pointing they' gun on 'em and say 'why you lackin'... funny but also ape tier

bruh, why u lackin'? you failed the no lacking challenge

no lacking challenge by Trias999 January 11, 2018

No Anime Challenge 

Everyone will be prohibited to watch their favorite anime from every month of 8th - 12th. Also, this is a Mandatory Challenge, which means that everyone are forced to participate into this challenge. If they lose the challenge, you can bully them for the rest of the day.

Aww.. I just lost the No Anime Challenge and I have a strong depression.

No Anime Challenge by Hmmm... Discord? December 6, 2020

chillin with no make up on 

the best response to the question, "what are you doing?". derived during the summer of 09, this phrase simply means that nothing is going on, but you are simply hanging around or relaxing (with no make up on). it shall be an amazing response for years to come.

Connor - hey what's up?
definitly not Steffi - nothin chillin with no make up on
Connor - oh thats cool wanna hook up later?
Again, definitely not Steffi - ok

chillin with no make up on by ldsfbhjasdbfhabhjvbhberjgf January 3, 2010

No Fortnite Forever Challenge 

When you restrain yourself from playing the video game known as Fortnite for the rest of eternity and if you play the cursed game you will be smited by God himself

Friend: Yo Homie Do You Want To Play Fortnite

You: Sorry Bro I Am Doing The No Fortnite Forever Challenge

No Fortnite Forever Challenge by MinecraftGoodFortniteBad June 25, 2019

A site where it's a challenge to find one subject where no one talks about sex. 

Urban Dictionary

LOOK UP URBAN DICTIONARY

"A site where it's a challenge to find one subject where no one talks about sex."

A site where it's a challenge to find one subject where no one talks about sex. by URB4N D1C710N4RY April 9, 2021