"a pattern of group behavior that ignores the presence or existence of a person within the group" -- apa.org. Alternately, "the experience of dying to others."
non-binary gender (concept)
Non-binary and genderqueer are umbrella terms for gender identities that are not solely male or female—identities that are outside the gender binary --wikipedia.
anime
Hand-drawn and computer-generated animation originating from Japan -- wikipedia.
"If you can't handle me at my worst, you don't deserve me at my best"
T-shirt slogan and Internet meme.
percentage of people with Cluster B personality disorders in the USA
Priority request: "It appears to be an epidemic but perhaps it is just getting more publicity." Cluster B includes antisocial, borderline, histrionic, and narcissistic personality disorders.
superstition
Irrational beliefs at odds with scientific knowledge of the world.
honorifics
"a form of address conveying esteem, courtesy or respect. These can be titles prefixing a person's name, e.g.: Mr, Mrs, Miss..." -- wikipedia.
NoFap
A movement to give up pornography and masturbation.
Blackstone's ratio
"It is better that ten guilty persons escape than that one innocent suffer." The phrase was absorbed by the British legal system, becoming a maxim by the early 19th century -- wikipedia. By request.
manchild
A man who is chronologically/physically an adult, but mentally/emotionally immature -- wikipedia.
hentai
Anime (animation) and manga (graphic novel) pornography influenced by Japanese cultural and historical attitudes toward sexuality -- wikipedia.
meritocracy
"system in which economic goods and/or political power are vested in individual people on the basis of talent, effort, and achievement, rather than wealth or social class. Advancement in such a system is based on performance, as measured through examination or demonstrated achievement" -- wikipedia.
giving / buying flowers for someone
If you're picking a girl up for a date from her house, and you're meeting her mother for the first time - buy the flowers for your girl -- instructables.com.