When a small goblin gets pounded by multiple oversized black males who thrust into him with 100kg of force in an oscular pattern. A Dirty Orfeas can also be when there are 4 white males instead of any number of black males.
For example "OMMMMMMMMMGGGGG, Stop thrusting into me with 100kg of force in an oscular pattern!!!!, this is such a Dirty Orfeas!"