You drop your pie on the floor and a large male with glasses obnoxiously says you dumbass, and then proceds to eat the dropped pie. You say your such an Allan Degnerous.
You could describe Cartman from South Park as An Allan Degenerous.
A charitable act, or altruistic contribution where in someone decides while having sex, to ignore all inhibitions and serve up a mix of all of the forbidden, nastiest, depraved and taboo sex acts they can think of to their partner. Especially if the partner has expressed an unfulfilled or inadequate sex life.
When it comes to my girlcaring about my unusual sexual appetite, her degenerosity speaks for itself.