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."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi