Either a man's dick that is so small that he basically has a vagina, or a woman's clitoris that is so huge that it could be a dick.

Used to describe (generally female) imagery that's suggestive, but in a PG-13 sense rather than an R or above sense.

When a penis grows with a vagina on the tip instead of a regular pee hole.

When a man has a very small penis, much like a large clitoris, thus looking like a cross between a penis and a vagina.

the cross between penis and vagina

During the act of sexual intercourse, when the penis and the vagina touch. This act forms the pegina complex ( similar to the sigma factor on RNA pol). Later, when the pegina complex seperates, it becomes known as its two seperate parts- the penis and the vagina.

penis/vagina