Doing a beer bong upside down, while hanging from the backside of a person while your legs stratle his shoulders. While another person is holding the beer bong for you to drink.
You are drinking at a party, and you have a funnel and a tube connected, therefore making a beer bong. Grab one of your buddies, preferably a bigger kid. Stand up and have him squat down between your legs, he stands up holding you on his shoulders, and then you lean back and then grab the tube from your other buddy and drink the beer til there is only foam remaining, or no more beer left. Thus completing the Inverted Rodeo Ride