While sounding like an innocent kiss kiss it means kill yourself kill yourself. It is mostly used when joking with friends through mobile messages
chick - OMG did u see tha ugly pic if urself on instagram
chicks friend - omfg kys kys
by suck my hairy ballsack November 13, 2013
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Stands for "Kill your self" a sarcastic term used amongst friends basically telling one another to shut the fuck up, when someone says something ignorant, embarrassing, or just plain stupid.

*not intended for real suicide suggestions, please stay alive y'all
Renee: OMG Keith urban is coming to town he's such a great rapper!

Jane: kys Renee
by jnhmpls96 January 24, 2014
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Know your stuff. To inform others quickly to ensure they have the proper information.
Bill - "Hey man, we all know that humans lay eggs."

Ted - "Dude, you should probably kys before you speak."
by CatalystKR April 18, 2022
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Guy 1: yo bro imma go riding on my bike
Guy 2: kys.
by the she male February 4, 2017
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