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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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9
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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10
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
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11
S.U. (said 'S-U' not 'sue') stands for socially unacceptable. It can be used in many ways but is often used as an exclamation. It describes situations which are akward, tense, or actions which are inappropriate in a given situation, or simply unacceptable according to social norms.
Did you just ask that complete stranger if you have something in your teeth? SU.

That girl is so werid. All I have for here are two words... SU.
by K,K&S April 08, 2007
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12
Shutup, a cleaner version of STFU (Shut the fuck up)
<Hex> I had such a dirty shit just now!
<Terran-Ghost> SU, for the love of god SU!
by Terran-Ghost June 03, 2003
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13
Usually seen in Snapchat Su in slang means Swipe up and or Shut up
It's seen in. Texting not speech
Example "Su who is this "
meaning, swipe up who is this?

Or
Person 1: did u see Madison's Story??!
Person 2: no, show me
Person 1 k, I'll send u a screen shot
Person 2: SU! SHE GOT A NOSE PIERCING??!

meaning

Shut up! she got a nose piercing?!
Shut up in the way of saying, No way or Omg really?!
by Wizz32 October 06, 2019
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