Brazilian Bike Ride

A act of the most horrifying sort. The bike rider is placed anus first upon a seatless bike's seat post until it is fully inside them. They are then pushed down a very steep (and preferably Rocky) hill.

Bimmy: Dude Jimmy's in the hospital!
Wimmy: Oh no why?
Bimmy: Someone gave him a Brazilian Bike Ride
Wimmy: Oh no!