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YFK stands for Younster Fun Kill.

This means when high leveled players kill players lower than them. They do this because:

1. They are bored.

2. They have a brother or sister PMing them to kill the lower lvl because the brother or sister might want an item from the lower lvl or they might want revenge etc.

3. High levels are sometimes douchebags.

4. The high level might need a refill.(Like pots, arrows, food etc)

5. The high level is annoyed with the lower lvl cuz he might be looting or FCing.

6. Random.
Runescape example:

I Kasoy I (lvl 124) YFKs NudyNud12 (lvl 89)

Sickrad2212: You see kasoy yfk that dude?

Tripdsa: Yea, what a YFKer.

Sickrad2212: Probabley for sharks or something.

Suddenly the loot appears on the ground. A few sharks, prayer pots and a dds.

Tripdsa: Lucky.

I Kasoy I: Ima YFK or pj you noob tripsda!
YFK by YFKER #1 May 7, 2009
Related Words
Yfke is a French / German name meaning “willow branch.” It's mostly used in Dutch speaking countries and Frisian places.

Yfkes are very smart and very caring. They are these kinds of friends you'll never want to ever let go in your life. They will always look out for you. They're very kind and very pretty too. They're creative and amazing at a lot of things, Everyone needs an Yfke in their life. They make everything better.
Person 1: Do you know the name of that new girl?
Person 2: Yfke.
Person 1: I knew it! She's amazing!
Yfke by Nightmare town April 13, 2020
You Fuckin' Knows It als Goldie Lookin' Chains (GLC)
"Dude, I JFYM and 404's Sister!"
"Oh snap! YFKI"
YFKI by Intertron December 11, 2004
Friend 1: "you wanna go to vegas next weekend?"

Friend 2: "YFKI!"
YFKI by Sahbatoge May 3, 2013
YFKM by KCJeffro October 31, 2007