An old man with a limited grasp of the English Language approaches you and your friend just snacking on some chips.
"Picnic Today" He says "uh yeah I geuss" you say as your friend sits behind you positively bewildered.
A short-form insult that stands for Kill Your Self. This is offen used in discord chats, Xbox Live or anywhere typical epic gamers may subside and interact.
"YOUR SO BAD, LITERALLY KYS BRO!"