A woman's vagina which is
unclean, infected, or
diseased. It is the type that most men would not want to be involved with.
Alternatively, one might say that they got some "nasty pussy" from a freak female who is very hot and mean it in a good way.
But usually, it is meant
in a bad way.
Man, that bitch has
some nasty pussy! I wouldn't touch that
with a ten foot pole!
or
Yo, I got laid last night and it was some nasty
pussy, man! That chick is such a freak!
