i am having trouble understanding what that means
So ask them to specify what they mean. Don’t accept generalities because your definition of a general concept may differ from theirs.
Bad question: Are they yeshivish?
Good question: Do they ask their Rebbi for help in major life decisions? Do they only eat cholov yisroel? Do they discourage going to college? Do they only wear black/white?*
The Wolf
* I don’t know that these questions are indicative of “yeshivish” behavior. They are used as examples only.