KYS Views 10 meanings found KYS can identify the Malian city of Kayes, but it is also seen in youth‑oriented programs and as an informal phrase meaning “know your stuff.” Miscellaneous Karissa Y Sanbonmatsu Kolej Yayasan Saad Know Your Stuff™ Kwak Yeon Shil Community Kapiti Youth Support Regional Kayes, Mali Business Kryso Res Sports Knox Youth Sports Kentuckiana Yacht Services Kentuckiana Yacht Sales