A term used for a person who got into something that they don't belong in. Such as when a person who is really bad at Football gets onto the Varsity team even though they're not that good and belong on the JV team, they just got onto varsity because they paid a lot of money or something. The term is a reference to how Boise State gets into BCS bowls even though they play nobody.
-Why is John our starting quarterback? He can't make a pass to save his life against those really good linebackers!
-Well of course he's the starting quarterback, he's a Bronco.
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.
Sex act. When doing it doggie style, you reach around and grab the girls tits and say something to piss her off ("wow, your tits feel just like your sister's..." "oh god, mary... (when her name is jane)" "damn, your loose, who'd you fuck now?" etc.) and try to hold on as long as you can.
I pulled a rodeo with amy last night, I was only on for 2.7 seconds. she's strong when she wants to be.