A person who does not tolerate naughty things and is wholesome on the outside but is secretly curious about naughty things his friends know, searches it up on the internet and immediately regrets it.
John: "Yo johnny do you know what a rimjob is?"
Johnny: "Nope."
John: "Search it up then*
Johnny: "wtf is this"
John: " Hahaha you are just like si yang"
Johnny: "Nope."
John: "Search it up then*
Johnny: "wtf is this"
John: " Hahaha you are just like si yang"
by Yourlover,.,.,.,.,, November 22, 2021
Get the si yangmug. 
A cousin so close and tigh with you, they're like a sister. They always have you're back and you can tell them anything.
The sister you never had
The sister you never had
by s_nizzy April 29, 2015
Get the cous-sismug. the sis shuffle is what you do during the add/drop period. when a class is coming up, you drop it on the sis (student information services) website and add another class that met yesterday, prolonging the beginning-of-semester itis.
by fat mels May 9, 2010
Get the sis shufflemug. by CocoaBeanz April 2, 2022
Get the sis suemug. by Scott Swanson February 12, 2003
Get the si partymug. by The Moses June 24, 2004
Get the cease simug.