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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
Kill yourself yourself
kysys by Green Giant 63 February 2, 2017
If your pissed at someone over text, kysmf is an acronym for Kill Yourself Mother Fucker
Girl: You bitch, kysmf!
Guy: What?
Girl: You've been cheating on me with Lindsay Lohan!
kysmf by yeeeeeeeeeeeeew January 27, 2017
Person 1 " Yo, you called my sister a bitch?"
Person 2 " Nahh, i called your mom a bitch, kyss"
Person 1 " oo, ight"
kyss by lemonsfm August 25, 2011
Acronym for Kill Your Self Slowly. Used particularly when someone is being a daft cunt.
Hey, asshole, kyss
kyss by WhiteyDoBow July 5, 2016
STFU MOFO and KYMS

Shut the fuck up mother fucker, and keep your mouth shut!
kyms by EvilAngryPissedOffBoy December 14, 2006