(1)The act of defecating on an object that is not a toilet. Predominately, on someone else's property.
(2) The act of unintentionally defecating in a pair of borrowed pants.
(1) Dude, I totally just took a dumple stiltzken on the hood of your step sister's car.
(2) Joe forgot to pick me up for work today, so I made a dumple stiltzken in those pants he let me borrow and put them in his locker.