Japanese slang for yoroshiku. The first 4 is pronounced "yo", the 6 "ro", the second 4 "shi" and the 9 "ku". These readings come from the way the numbers are pronounced in Japanese. 4 can be "shi" or "yon", 6 is "roku" and 9 is "kyuu" or "ku".
by Yoroshiku August 12, 2008