Origin: Hokkien – gao means thick, gao gao means very thick
Gao Gao are two words with the same meaning of thick and when used together represents it as extra thick or concentrated depending on what the usage is for.
Xiao Ming: Uncle, give me a cup of Kopi Gao (Thick Coffee).
Coffee Uncle: What happened? You look super sleepy. Going to work ah?
Xiao Ming: Ya lor need to go work…last night watch World Cup Football until 4am.
Coffee Uncle: Ok, Uncle give you gao gao one, confirm you can stay super awake later at work.