Si

“Si”
by TwistyNoodles July 27, 2020
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sis

the abbreviation of "sister";
a genderless term much like "bro" or "dude"

people can also say it like "sister" but that doesn't change the definition

like when you say "brother" instead of "bro"
-"How do you feel about celebrity drama?"
-"It's the tea, sis."

-"Hey sisters!" -James Charles

-"How u doing?"
-"I'm so fucking depressed, sister"
by Bakuhoe Katsubitch January 10, 2019
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-sies

Suffix added to the end of almost every word. Used mostly by 40 year women talking to their children and/or dogs, or drunken college whores in a desperate attempt to sound more cute, less riddled with STDs and premature, substance induced age.
Ok, who wants napies?

Who's got tired little legsies?
by Ihateyouallsomuch July 08, 2005
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sies

(suffix)

Dialect of UnaRocks added to the end of various words for no particular reason.

'Sies disease' is the propensity to become addicted to the suffix 'sies'
That car is awesome, wantsies!

I'm so hungoversies today

Would you like to go for some drinksies this evening?

I have the sies disease so badsies
by UnaRocks December 13, 2007
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sis

1.) A South African English expression roughly equivalent to the American "yech" and the Afrikaans expression "sies".

2.) An American term of endearment for a sister, now also used in other countries.
1.) Sis, man, you stink!

2.) Hey, sis, hey bro, how's Ma doin'?
by Xaviana December 01, 2003
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SIS

a genderless term much like "bro" or "dude"

you don’t have to be BFFS. You don’t really even have to know them. If she seem chill. then SISSSSSS is what they should be called!
JACK: *texts Jill*

“ SIS! You’ll never believe what popped up on Greg’s phone!!”

Jill: “Girl, SPILL!”

Jack: “Some HOE’S NAME! Do you think he is cheating on me?!”

Jill: “ SIS! YES! Leave his ass!”

****you can also use it in less dramatic scenarios****
by URB@NL3GEND March 05, 2020
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si

Short for "System International." Also known as the Metric System.
The SI system makes more sense than the English system. It should be officially adopted by the US, but we Americans are too lazy for change.
by BlastMaster June 13, 2003
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