NT

The Chinese way of saying braindead, "脑瘫". Nao tan

这个人多多少少沾点nt. (This person is braindead)

Osteopathy

Origin from a story of a pair of German siblings where the brother raped his sister and got beaten to the hospital and broke a few bones. Mostly used by the Chinese to describe incest (sibling) relationships.

the most famous sibling love relationship of yosuga no sora between Haru Kasugano and his little sister Sora Kasugano is defined as Osteopathy