There are two Chinese women who sit behind me in the office and often converse in Mandarin throughout the day. I barely pay attention for the most part, but there is one phrase repeated frequently that jumps out at me:

Ne ga. With a very soft 'e' in the first part.

It almost sounds as if it could be a word like 'um' or 'like', it comes up so frequently. Sometimes it's repeated a couple times in a row: "ne ga ne ga.". Does anyone know what this means?