g9g means: The expression “gg” can be used to describe someone’s incomprehensible behavior or unfortunate events. “g9g” is pronounced “gee gou gee”. “COCK” can be spelled “gou” in Cantonese. It emphasizes the absurdity of the situation by adding the “gou”: “mud 9 ye ar lun yeung” “diu 9 lei gor chow hai” “on9 9 yak bun jow” etc. (in Community Dictionary, added by Balduino Medina)