YBK Views 6 meanings found YBK appears in internet slang to label aggressive youth groups, serves as the short form for Microsoft’s Encarta Yearbook, and is used by several Indonesian charitable foundations. Miscellaneous Yayasan Bagong Kussudiardja Yönetim Bilimleri Kongresi Yayasan Basmi Kemiskinan Community Young Blooded Killers Regional Baker Lake, NorthWest Territories, Canada Computing Microsoft Encarta Yearbook