Used in the movie Pulp Fiction describing the female's vagina.
Jules puts it best:
Jules: Whoa... whoa... whoa... stop right there. Eatin' a bitch out, and givin' a bitch a foot massage ain't even the same fuckin' thing.
Vincent: Not the same thing, the same ballpark.
Jules: It ain't no ballpark either. Look maybe your method of massage differs from mine, but touchin' his lady's feet, and stickin' your tongue in her holyiest of holies, ain't the same ballpark, ain't the same league, ain't even the same fuckin' sport. Foot massages don't mean shit.