Is this phrase an insult?

Hi all, need help with another YouTube clip.

The concept is that the "NaiNai" comedy group lines up a bunch of poor 外人 and teaches them hilariously wrong things about Japanese language and culture, under the guise of helping them meet Japanese girls.
Seek to 3:36 to see a "lesson" about 名刺 . During the example 名刺 exchange, they repeat a phrase I'm completely unfamiliar with, where they would usually say something like よおしくお願いします. The phrase is:

なんだちみは。

Is this some sort of insult, and that's why it's funny? What does it mean? I googled it and found only one hit where it was coupled with このやろう, which I already know is not complimentary!

I apologize in advance if I've posted something excessively vulgar
Thanks again for the help.

永王

Don't worry about vulgarity! Ninety-Nine is a favorite comic duo of mine! They "usually" practice common sense.
I haven't seen the entire clip, but I'm sure they are careful not to go to extreme in poking fun at foreigners...(I hope!)

ちみ in なんだ、ちみは is a comic variation of 君（きみ）coined very long ago by a veteran comic (I don't remember who but I do remember the time when it became popular). So, it plainly means something like:
So, what are you? (So, who are you?)

HTH!

He wanted to get "laughter" from Japanese audience after he taught something different or funny to the students.

No time to say something funny when you exchange your name card with 5 or 6 people. All you can say is "Nagaoh desu. Yoroshiku onegaishimasu", or I am Nagaoh. Please to meet you.
But it is not rude to ask when you don't understand how to call the name.

Both great answers. I also think they are funny and will be looking out for more clips from them.
ありがとう！

I liked that combo too.