Excessive love for one's sister(s), often past the point of ordinary brother-sister/sister-sister relation. Often used as a tease/insult for a person who's overly protective of his/her sister, and is shortened as sis con or sis-con.


Derived from Japanese word "shisukon" (sis con), and is often used in manga and light novels.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

The belief that an older brother is the only one who can rip or make fun of his younger sister.