You want to call yourself or other person.
Sis(me) will not forget what sis(you) have done.
by Sis Deli August 06, 2018
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A fast looking, slow car.
"Dang, that Civic looked quick, but it turned out to be an SI-7"
by TunerFocus February 27, 2010
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Very Famous Person, usually a class clown, asian name normally. Smart, intelligent and athletics
You are very Yu Si
by Yu Si November 01, 2019
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Everyone knows what a stepsis is, but the meaning a 13-year-old thinks is the sister always wanting sex on the hub
(Step sis) Don't stop stepbro or else I will tell mom you watched me take a shower
by Magnumduckdoogler August 19, 2019
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A strong and cute girl. Si Ying is a fun-sized and huggable girl that loves Kpop and calligraphy. Si Ying can make a great best friend and will always stay by your side in your times of need. She can keep you entertained with her unlimited jokes. She is a naturally humourous person.
Boy: OMG! Those jokes Si Ying tells are hilarious
Girl: I know right! I wish I was as funny as her!
by Jerry Stilton June 01, 2018
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A person from Staten Island who is not a guido, unlike most of the inhabitants of that island. Instead they enjoy sports(especially random statistics that are usually wrong and also rooting for teams from outside NY), XBOX 360 and eating in a very disturbing manner. Usually an accounting major.
I went to Staten Island this weekend, man did i see a SI Pomp at the restaurant i went to with the fam.
by FOXTROT3434 November 02, 2010
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