Belgian Dump
Where two people defecate simultaneously on a single toilet by sitting face to face. The one on the top must be on top of the one who is facing normally on the toilet.
You and a friend must use the toiletries but there is only one bathroom. To solve this problem, both of you can go at once by one person sitting normally and the other sitting in reverse on top of the other persons legs. This is known as the Belgian Dump.