What is Ja Jiam Mein?

This is on our local Chinese takeout menu, but I don’t know what it is. The description is “Most popular authentic homemade noodle with choice of shrimp, beef, chicken, pork or combination.”

I asked when I called in our order for other food and I understand it is similar to Lo Mein, which I am familiar with and like, but with a different sauce. Unfortunately, I could not understand his description of the sauce.

I have looked online with no success. The closest I can find is Jia Jia, but I can’t even find a description of what it is beyond a noodle dish.