bison tits
Bison Tits. They may be saggy, but they are massive and fun to play with. Bison, also meaning wild, meaning that the owner of these are wild, so be cautious, and take care when milking them.
i.e. "I grabbed her Bison Tits, and they Jiggled Wildly, so all I could do was take two steps back and enjoy the show."