我個fd 有時會講 ngng.....請問係咩意思?

ngng=嗯嗯=認同的意思

it depends on how he said it,
if he say n-g, n-g, it usually means NO GOOD, NO GOOD,
but if he said ngng (pronouncing) that usually meant no and no.

55掛我think系掛

ngng是唔唔

ngng = 屎