Keep Yourself Safe, it is used when people are going on a trip or in a fighting game and you win.
Person 1: HOW DID U WIN KYS U R 2 GOOD!!!!!!!!!
Person 2: Yes, kys too.
it means kill yourself but if anyone asks just say it means "kiss yourself"
person 1: kys lol
person 2: what does that mean?
person 1: ... Kiss yourself
person 2: how tf-
Kys can mean "Keep you safe"
Exemple: Team keep your safe! Team kys!
'Mate that's a sick polo you got there bro'
'Do you see any buttons? It's not a polo, KYS'
Keep yourself safe
Means when you love your friends and want to show them you really care
You hsve a lovely opinion so i want you to kys