mannheim steamroller
noun:  when someone requests a second party to roll over on their stomach. the first party proceeds to defecate on the second party's back. then the defecater takes a pizza dough roller and flattens the feces across the persons back
I got so drunk last night at this enema clinic, I woke up with shit smeared all over my back.  The nurse told me I was mannheim steamrolled. I then waited and slapped her in public.