Dark enlarged pussy lips. They may vary in size.(sometimes referred to as roast beef).
That ho had some nasty muddflaps. I asked her if she drove an 18 wheeler. Those muddflaps made my dick feel like it had a turtleneck on.
by Eddie January 19, 2004
Mudd flaps are when a female's pussy, has big, plumb, and juicy lips.
"Hey Mikey , I was eating Aunt Ann pussy last night and, wow, she had enormous mudd flaps!"
by Gus B August 24, 2006