KYS is an internet slang initialism that stands for "kill yourself". It is used as a taunt or form of harassment issued after someone has done something embarrassing or foolish. Teenagers use this slang term either as an insult to their peers or as an actual bullying threat to encourage the recipient of the message to commit suicide. The use of this slang expression should be discouraged even if it’s used in a joking manner. It is a variation of "kms" and is typically used when texting or messaging.