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

Seizing 

When you’re shooketh to a state that you can’t even move anymore.

“Bruh, I just saw this guy and I’m seizing over how hot he was”

Seizing by Okie2019 August 25, 2018

seiji 

1. the sexiest most beautiful asian you will ever see. everyone loves him, hes sweet and charming and is the only asian to ever to have a big dick. he does some dumbass stuff sometimes. everyone thinks hes on drugs, but he just has no common sense.

1."omg, you know that guy seiji?"

"yeah hes so amazing i love him!"
2."wow seiji is cool, too bad hes on drugs."

"hes not."

"are you kidding he just tried to smoke a chair leg!"

"hes just dumb."

"oh."

seiji by theneverendingcircle January 4, 2012

Seiji 

Awesome. Simply awesome.

Seiji = Awesome

Seiji by definingtheworld! February 6, 2010