You start by going doggy style and then just when she is really enjoying it, you grab her tits as tight as possible and yell another girls name. This gives you the feeling of riding a wild bronco as she desperately tries to buck you off.
"That bitch never even saw the bronco coming last night."
during rear-entry "doggie-style" sexual intercourse between two people, a male and a female, the male grabs the females tits and whispers into her ear a disgusting phrase; i.e "I have AIDS." or "Your not quite as good as your mom."; and the feamle will then most likely wildly try to end the intercourse and the male tries to hold on to her for as long as possible; this is called the "Bronco or the "Bucking Bronco
"Man, last night was fun. I gave my whore the bronco"