hump bumper
The pads they put on the walls in hotel rooms over the beds instead of headboards, so while you're nailing a chick her head doesn't bang the wall.
I was screwing her so hard that night she kept smacking her head on the hump bumper.
bumper humping
When a vehicle behind you is so close to your bumper that it could hump it!
That person behind me is bumper humping me.