Bike Ass
The uncomfortable sensation in the tail bone that has similarities to the pain caused by sitting on a bike seat for long periods of time.
Richie had a bad case of bike ass in the middle of class, though he has not rode a bike in a year or two.
Ass bike
When the pointy part of a bicycle goes inside the anus
"Did you hear what happened to joey last week?"
"No, what happened?"
"Poor guy got ass biked in the middle of the park"
"No, what happened?"
"Poor guy got ass biked in the middle of the park"