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Keep Your Fucking Mouth Shut. First rule of pranksters.
"Jamie got into trouble for letting loose those thousands of grasshoppers in the basement!"
"Well yeah, he violated KYFMS."
KYFMS by tripzilch August 15, 2009
Related Words

kymas ranjumar 

A true power couple who love each other very much. They fight hard and are honest with each other. Ups and Downs do happen, but they always find a way.
They play hard to get but they are perfect, kymas ranjumar
This can mean two different things.

1. Kiss My Fucking Sugar Lips

2. Kill My Fucking Self Laughing
1. I'm soooo cute! Kmfsl♥
2. Did you see that girl get her ass beat? Kmfsl!
kmfsl by meowmeowkittycat September 8, 2012

kymistre 

The best friend in the world best dancer amazing perfect pretty different in a special way you would wish she was in your life she doesn't like drama
Everyone wish they had Kymistre
kymistre by Braceface_leo February 25, 2018
STFU MOFO and KYMS

Shut the fuck up mother fucker, and keep your mouth shut!
kyms by EvilAngryPissedOffBoy December 14, 2006
Kill my fucking self. A more intense version of KMS Typically used when you're having an awful time, or if a unfavourable situation were to arise, so much that you want to die or are considering suicide. It doesn't necessarily mean you'll literally kill yourself, it can be used as a hyperbole.
1) I lost my job, I can't afford rent, my grandpa died recently, fuck it, I'm gonna KMFS.

2) If get woken up by my neighbours at 6am again on the weekend, I'll KMFS.
KMFS by fatalpulsed June 13, 2018