aiyo, i think all the terms in different dialects confuse us all ;p
"gang gang hu" (chinese), u have to have 4 sets of 4 cards (3+1 gang) that are the same, plus pair of eyes, means everything must "gang" cept the eyes. that's how i play amongst my kakis. But i guess some use gang gang hu to describe what u gamed, which u "gang", pull from flower pot, "gang" again, pull second card from flower pot then game on that card, all in the same "pull".
mayi arrange for a game loh, hehe