What does "traditional marriage" mean to you?

I was talking to a woman today who I see all the time, but I don’t know her very well. She talked a little about her job, a possible promotion, but was leaning towards not taking the promotion while her son is still young. He is a teen, but he can’t drive yet. She still takes him most places, including school, and the promotion would mean more hours at work. She also talked about how she let’s her husband make a lot of big decisions, she doesn’t even want to make the decisions, he is much better with money and dealing with the finances in general. She has a master’s degree, does pretty much what she wants within the bounds of what most parents have to do in terms of raising their children.

Anyway, she said some of her coworkers criticize her because she has stated she believes in “traditional marriage.” I asked her what that means? Does she mean marriage between a man and woman? Turns out no, she is fine with gay marriage. She means basically what I described above. That to me sounds like a “normal” marriage. I can’t figure exactly what her coworkers are criticizing, and I can’t quite figure what an untraditional marriage would be? The terms elude me. Is it some sort of Christian lingo I don’t understand?