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
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n. an affectionate nickname for Ratty Room 6 in Brown University's Sharpe Refectory, where the brothers of Alpha Epsilon Pi eat dinner together every Wednesday at 6 pm
Jon: "Alright, I gotta run to the lab now, need to finish a Western blot."
Dave: "Are you coming by later for a little uh...a little...Ratty action at the Seis?"
Jon: "Definitely, I'll see you there."
by Railsplitter April 27, 2007
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Direct descendent of the prophet Muhammad in the middle east, title of respect given to those of this blood line.
He's very religious and respectful.
He's a Seyed, he must be a great muslim.
by PersianDictionary January 11, 2013
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Used as a substitute for yes. Originated from "yes" spelt backwards: "sey" and also has a similar pronounciation to that of the Spanish word for yes: "si".
"So, you wanna come get high?"
by Adam "Ad" Frost April 26, 2004
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A word that is used in time of stokerage (see 'stokerage')!
*Guy sees a dude do an awsome reverse air (bodyboarding move)* "SEYYY!!!!
by Stevo September 10, 2003
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Name or title of a respected middle eastern with a bloodline to the prophet Muhammed. In no way has anything to do with any form of Terrorist organizations, but it does tie into the Islamic religion almost hand in hand. Fierce fighters from this bloodline.
Seyed is an incredibly opinionated man, but he's so traditional.
Don't mess with a Seyed they know what's up!!
by DisNikkuh January 11, 2013
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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
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