nuqneH is what you might say to someone who comes up to you but doesn't immediately state their business but simply hangs around.
They're obviously here for something, so you might say, nuqneH? "What do you want?" so that they will tell you why there are there.
It has nothing to do with understanding.
"Do you understand?" would be bIyaj'a'? when speaking to one person.
In this case not really Nuqneh is a classic from the OG Tapes. While legacy and not really used that I know of. Still fun and useful. LOL just don't do what I did "What the blank do you want Human!" (just say it didn't work) However Nuq (thing here) comes up so useful to know. And yeah not really the same thing as