Sivinski 

A Sivinski is a gorgeous person inside and out. They are funny, intelligent, fun loving, nice, down to earth, and great advice givers. You should never let go of a Sivinski, cause you know you have something special.

"That girl is so awesome! whats her secret?"

"She is a Sivinski!"

"Oh that explains it!"

Sivinski by 7-$k! June 24, 2009

Sivinski Product

The anti-Markovnikov addition of an carboxylic acid derivative across a di-substituted alkyne in a solution of cold, dilute, potassium permanganate (KMnO4).

"Gentlemen, we have synthesized the Sivinski Product!"

"We fucked up again! This is the Sivinski Product! START THE REACTION AGAIN!"

Sivinski Product by 123jared123 May 9, 2010

Siminski

The most bad ass polish clan ever. dont fuck with these guys cuz theyll kill your whole family for laughs

mark siminski just killed brian and chris for fun.

Siminski by big m bitch February 3, 2010

Sheridan Slivinski 

A amazing girl who is very outgoing, and loves to make you laugh. She's very hot and a good girlfriend. Sometimes a little too honest for you to handle. She loves her family and friends. She's very loyal and kind to all, friend or no friend

Sheridan slivinski is my best friends she's the best!

Sheridan Slivinski by Sheriiiiideeeennnn July 11, 2017

Claire Shivinski 

Beautiful, funny, sarcastic, outgoing type of girl with a kind heart. Music taste is good as long as Taylor Swift, High School Musical, Jonas Brothers, and/or Spanish music isn’t being played. A Claire Shivinski is the type of person that tries and tries to be good at sports/activities/games but often comes up short.

Bill: Wow, that girl in that car is a Claire Shivinski..
Mark: who? Her?
Bill: Yes, her. She looks hot af and I think I hear shitty music coming from her blue crappy car

Claire Shivinski by Kev McAllister November 23, 2021