What is German Shower?
1.
The act of defecating a violent stream of diarrhea onto the head/face of another or oneself*.
The german showerer's anus plays the part of the shower faucet while the showeree enjoys** the hot fecal material enrobing his/her visage.
*see
**It is quite often the showeree does not in fact enjoy this.
"One day I consumed 3 gallons of spicey chili and went and annihilated my girlfriend's face with a violent torrent of jalapeno pepper laced excrement. She quite enjoyed the German shower but the jalapeno peppers-not so much."