while at partys you occasionally notice a woman of defined body and stature of a bison.
Party bison are more often than not sexually aggressive, although appearing lethargic. after 3 smirnoff ices they try to spend the night with drunkened male party-goers who have drank far more than her. parties don't have to be limited to one bison, there may be many in a single room.
Charles T: "Did you watch that party bison wander into the Brewery?"
M. Boskey: "yeah, im pretty sure Donny hooked up with her"