vaganus: Most often used as a descriptor of an uncommon female disorder in which a linkage occurs between the vagina and the anus, causing drunken whores to expel their unborn fetuses at a high velocity. This often causes developmental problems with the baby. There is also documentation of a few rare cases in which the female is able to get pregnant by manually stimulating her vaganus.
Usage: I met this girl the other day. She was really awesome, so I asked her on a date. Afterward, we went back to her place to have sex. I wanted anal, but it wasn't possible because she has a vaganus. You could run a freight train up in that shit and it wouldn't touch the sides.