nun hut
The nun hut is where nuns live. It could also be used as a term for an abode where women who don't put out live - like a sorority that prides itself on its academic record.
"Did you get anywhere with Tiffany the other night?" - a.
"Are you kidding, she lives in the nun hut!" - b.
"Are you kidding, she lives in the nun hut!" - b.