German forest
A figurative term referring to a subject that has become so hard, so dense, and so difficult that you think to yourself: "how am I ever going to get out of here?"
The discourse on quasi-positivistic Nietzschian existentialism has lately become a veritable German forest.
German Black Forest
The act of defecating in a woman's vagina, usually done with solid, firmer stool as to provide ample pressure to assure penetration.
This bitch was so nasty, not only did she want a hot lunch last night, but she wanted a German Black Forest too, so I gave her one. Luckily, I drank milk all week and was constipated before hand.