What is Person 2: Ahahahahha?
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3.
A peticular person close to you that you use as a nickname when they are to be honest, doing really anything.
"Pelon, you make my life."
"SU, YOU ARE SO CUTE!"
"why are you not answering my phone calls?"
"don't worry about it, su! :)"
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4.
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.
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5.
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!
6.
Stumbleupon, the social channel surfing network.
I've rated 1000 pages on SU
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7.
In the manga "Pita-ten", Misha likes to scream this randomly. It isn't a real japanese word-but it's still fun to scream randomly.
hey look, a pie su!
whats up su!
OMGWTF, the world is exploding! Suuu!!