When a vagina has lips that are large enough to stick together creating a singular shape that resembles a loaf of bread that must be sliced before being eaten.
"Damn, she has a nice lil muffin loaf on her and I'm about to get me a slice!"
"Some people like an innie and some people like an outie, I personally prefer a nice muffin loaf."
"This bathing suit is so small, I feel like my muffin loaf is showing."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.