Now, 'Man Cave' I've heard of, in fact, we had a really good one in our last house:
In our current house, husband's stuff is in the Moffice (the Man/Office) and the Ranger "Mess with the Best, Die like the Rest" flag has been retired, but Lou Gerhig was able to stay. And it is nice that husband has his special place, but what about me? I will say that arguably, our entire house could be the 'mom cave' since husband didn't realy decorate anything, however, I did take into accord that he would be living in these spaces too, so I did not make it look like I had 3 female roomates.
A quick search of 'mom cave' revealed little hits, save a few blogs and Homegood's giveaway, but I think the term will catch on. According to their site, the mom cave should have:
1. A place to converse
2. A place to work, write, blog, craft, ect
I'm totally in to it! Homegoods marketing team, you win.
*Images from my basement, Coastal Living and House Beautiful