To be incredibly epic at basically everything. Seems to be from a different dimension, though this is up for debate. Will not admit to having ninja skills even though said skills are witnessed regularly. Prone to anime-type reactions (aka loud and obvious), usually ending in some form of destruction.
Person 1: WTF happened in here!? All the desks and chairs are destroyed!!
Person 2: Someone pissed off (insert random name here).
Person: What an idiot, everyone knows (insert random name again) is a Sei.
by Kiri :D June 20, 2010
A person who breaks the Sixth Commandment which signifies the person slept with a married person.
"Oh shit! He just pulled a Seis"

High five for scoring with a married chick man!
by Seis716 July 20, 2010
a female girl.

also has lots of pink.
that sei is mad retarded
by Canin July 20, 2003

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×