Another word for vagina.
In reference to when a baby is born, the outer part of the vagina flaps in and out for about a second or two. This gives the appearance of saloon doors opening and closing like in old western movies when a cowboy walks into the place.
Did you see that that chick give birth?! That baby came flying out of those saloon doors.
Another term for well used beef curtains
Her saloon doors were well slack... she'd been around!