SU (said 'S-U', not 'sue')stands for socially unacceptable. It is mainly used as an interjection or adjective to describe things that are socially unacceptable, weird, bizarre, or simply inappropriate in a give situation.
Did you just ask that complete stranger to rate your ass? S.U.!

That girl is such a freak. All I have for her are two words... S.U.
by K,K&S April 07, 2007

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Top Definition
su
calling of the Wu-Tang Clan
On behalf of my crew, SUUUUUUUUUUU, Enter the Wu
Thirty-Six more deadly Chambers, to take you through
by killah beezz June 27, 2010

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SU
SU is short for Super Unicorn. This one of a kind creature has been living for the past six centuries and knows about everything (except computers because he was busy preaching philosophical lessons when computer science was advancing). Many people believe that SU does not exist but historical sightings reveal that the creature may indeed be living among us for a very long time. SU was last spotted in the country of India, more specifically in the state of Maharashtra, according to certain unreliable sources.

Anecdotal evidence suggests that this creature is very similar to male human beings in terms of physical appearance.
He is known to possess certain powers which include Victory Dance, Intellect Beam, Emotional Torture, and Future Sight. He is also known to be a very wise and mature creature who offers advice to anyone who asks for it (and anyone who does not).
SU is known to have made and lost many friends in his long life so he appears to be rather recluse at times. He has been seen hanging out with turtles and tortoises often. The slow animals live a long life, very much like him, which enhances their friendship.
SU is known to be a social creature with anti social tendencies. To remain hidden from the prying eyes of the world and still maintain his original identity, he takes names with initials S.U. and tries to blend in with humans. He makes sure that he does not develop deep and strong bonds with most people because he is sure to outlive them.
Girl 1: That guy is definitely SU. I know it, I can feel it. I wish he noticed me.
Girl 2: I know, right? I wish SU would notice me too but we can never be so lucky.
by shakalakaawohoooo January 27, 2017

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su
nickname for syracuse university
SU has a really good basketball team.
by jpp133 November 02, 2007

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su
A way to say "Shut Up" on AIM or AOL Instant Messanger.
Person 1: UKFdhghgbvufbhdfbjk

Person 2: su

Person 1: =... wait what?

Person 2: ahahahahha
by sheelajdbnsauidb March 25, 2009

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su[
Yet another internet typo slang word. This one is for the word "sup", a shorter version of the popular greeting of "What's up?"
"Su, fool"
by JT May 03, 2003

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s.u
SU (said 'S-U', not 'sue')stands for socially unacceptable. It is mainly used as an interjection or adjective to describe things that are socially unacceptable, werid, bizarre, or simply inappropriate in a give situation.
Did you just ask that complete stranger to rate your ass? S.U!

That girl is such a freak. All I have for her are two words... S.U
by K,K&S April 29, 2007

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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