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1. To misspell the phrase, "See you!" when writing good-bye.

2. Used to describe a petite Asian girl of unnatural strength, on par with the fictional character "Chewbacca," from Star Wars.
1) "You idiot, it's spelt 'See you!' not 'Siyu!'"

2) Guy 1: "Wow. She just totally picked up that dude and put him in the trash can. She's such a Siyu."
Siyu by Harold Opacus December 29, 2007
Related Words
Nice, kind, good looking, dreamy, humble

Basically almost perfect
Why is Siyu such a Siyu ?
Siyu by 11111 two November 21, 2021
defines the meaning of siyu
Siyu by nononoonononon October 28, 2019
not a mistake of spelling but an Asian girl it is not pronounced see you but instead in an accent and is usually really tall and funny positive humble and is insure but usually get called pretty but act tuff and always has a crackhead energy
siyu later siyu
bruh wat u call meee
siyu by bwuhwu November 19, 2019

Siyu Cao 

The most epic person to ever walk the face of this earth. This man is hot beyond reason, and is bound to make any girl fall for him instantly. He is the best gamer to ever walk the Earth. Rumor has it that he hit Diamond in Paladins despite being cursed by deadpoolkid1037. His physique stuns even the most dedicated body builders. With his Ultra Chest™, none can stand against him.
Siyu Cao: Hey it's me Siyu Cao here to kill you

Dead guy: *dying sounds*
Siyu Cao by angrybirdandy October 25, 2018

Zhang Siyuan 

Zhang Siyuan
1994-09-16
Virgo

Participated in Youth With You, Chinese idol competition show.

🥵

He is a RAPPER. The most talented, most handsome SEXCCCC mans in the world. G.G. cutest most adorable everyone loves him