Big-girl mouth
A slang term for a vagina. Usually used in regards to what a heavier woman with an ugly face, one you can't imagine actually having sex in any way, would call her own vagina.
"What do you think Nikki calls her vagina during sex?"
"She's probably like 'Oh, yeah! Stick it in my big-girl mouth!'"
"She's probably like 'Oh, yeah! Stick it in my big-girl mouth!'"