the term "
gg" is commonly used when someone does something ridiculous stupid, or an unfortunate event has happened.
"g9g" is pronounced "gee gou gee". "gou" is the cantonese
slang for "COCK". By adding "gou", it further emphasizes how fucked up the situation is, such as the following:
"mud 9 ye ar lun yeung??"
"diu 9 lei gor chow hai!!"
"on9 9 yak
bun jow"
etc....