KYS is short for ''kill yourself'' this word is often used as a joke and should not really be taken serious by anyone
hey dude just KYS haha jus kidding
Stands for keep yourself safe.
Person 1: I'm going out tonight
Person 2: Be sure to kys
"kys" is an abreviation for keep yourself secure, its usually used when theres a possibility of someone getting injured by causes such as hurricanes and other natural disasters.
Hey Luke, have you seen that theres a flood warning near where you live, kys man.