"Geh Gao" is a hokkien term that refers to someone who pretends to be a smart, while in fact, that person is not.
I'm being one Geh Gao person today (just for t0day only) because I ruined two of my coursemate's marks (only one mark lor..sorry lor...) by telling them the wrong answer for buffer calculation.
Hehe. Dont hit me, I know I'm kiam pak, but I didnt do it on purpose!
Just like what Soo Chuen loved saying at me "Mai Luan lar, Lu Mai Gek Gao Gao lar!" (Shut up, dont be smart!)