sis

stay in school, from peaches song "fuck the pain away"

sis iud stay in school cuz it's the best

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SI

A term often used when talking about mental health treatment meaning suicidal ideation or suicidal thoughts

My SI had been chilling lately

SI

Sisteme Internacional

SI units are the best, man. Inches suck.

SIS

Typical abbreviation for the Saying "Slaves in shackles", Racist.

"Don't do that sis" (Don't do that, slave in shackles" "are you a sis?" (Are you a slave in shackles?)

-sies

A suffix added to any noun meant to accentuate the word in the sentence. Manages to get very annoying.

"Let's go and get dome drinksies."

"Crazy wetness in the poolsies!"

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si

Abbr. Simple Simon. Individual renowned for extreme stupidity and slowness of mind.

"Jog on you si - you're as thick as pigshit" or "he's a proper si that one, thicker than a King Edward yoghurt"

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SIS

acronym for snicker inside - use instead of LOL when describing what one is actually doing when one chats/texts.

person a: I blacked out last night and lost my pants.
person b: SIS. You friend, are unpredictable.

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