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SI

sexual intercourse sex hanky panky hot hottie awesome cool sexy 1. a word and hand-sign created to refer to sexual intercourse in a way unknown to rejects, spazes, and especially older, uncool adults, so your conversations remain esoteric.

2. this term can take the place of words such as hot, hottie, sexy lady, ect.

3. SI can also replace cool, awesome, ect.
ex1: Things are really going well with my gf. I think SI is an inevitability.

ex2: Whoa! Check her out! SI at 10 o'clock.

ex3: "Hey, there having free food at the party, and there's no addmission price this time!"

"Really? Aw, SI man!"
by Oddjob 007 September 28, 2006
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SI

Socially Inept.

Seen in episode 13 of "Rugrats: All Grown Up"
"Lil, your brother is what he called SI, you know, socially INEPT"
by Johnny Skeets September 18, 2005
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si

derogatory term for man who thinks hes a fox.
si, you isnt a fox dude!
by kezza January 30, 2005
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si-an

Also Spelt Sharn.
si-an is a slang MSN term
for big chin
it also consists of a bob blonde boy cut
and 'thinking your indie'
Taking wrongly Shaped bebo photos covering your massive chin.
-SIIIII-AAAAAAAAAAN-
-whos? got a si-an?-
-looks at bebo picture-
-massive chin-
by Dropdeadchloe January 16, 2008
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Sis

A sexual nickname between gang members.
by Gang guy 254 October 14, 2016
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Sis

1- hey

2-hey sis
by Mandagrace99 November 24, 2018
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Sis

A word basic bitches use to get a point across.
It’s the most cringe worthy word that can be used and should be illegal in every way.
“Omg sis I just got a brand new Rolex”
“Sis hop in my fiat500 let’s go for a ride
by Shanosthetranos July 6, 2020
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