seijinn 

To pussy out of any social contact of the female persuasion. To insinuate any kind of sexual innuendo on the internet while maintaining said pussiness. Fear of women. Envious awe of men who actually socialize with women.

Tony never leaves his house, he's so seijinn it's not even funny.

seijinn by retpro December 10, 2008

seijin 

means adult in japanese. often used to describe anime pornography (it is NOT hentai. Hentai is a kanji (compound word) of the words Hen (strange, weird) and Tai (behavior, attitude, appearence etc etc) It is always used to describe a person and NEVER anime or manga) If someone was going to point out anime pornography, they would say "seijin-anime" or "seijin-manga". NOT "hentai"

average schmuck: hey man did u see that hentai NG is advertising?
smart person: its not hentai its seijin.
average schmuck: oh realy? I didnt know that

seijin by G-Imago130 July 10, 2006

seijin 

Seijin (星人, Star-people), which roughly translates 'Alien', are extra-terrestrial beings that originate from their respectively named planets, or are otherwise sentient aliens as opposed to simple Space Kaiju.

In neo-kaiju toys, this generally refers to sentient aliens.

Baltan is definitely my favorite seijin from Ultraman.

Have you seen the new glow-in-the-dark seijin release by Elegab? It's a lottery, so get your email in quick.

seijin by hellointerloper December 27, 2014

Seijin 

Seijin, which refers to humanoid aliens from space, means a ‘Person from the Stars’ in Japanese.

Ultraman is the most popular Seijin in both Japanese popular culture and the pop cultures of many nations in general.

Seijin by Snapper2001 May 15, 2023

oppai seijin 

Person who loves big tits (esp. anime titties)

Pedestrian oppai fan: Bro did you play this god tier nukige called oppai academy?
Based loli enjoyer: I ain't no oppai seijin ya dipshit. I only play lolige.

oppai seijin by pyun pyun April 14, 2022