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"
by Yourlover,.,.,.,.,, November 22, 2021
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A weird person who’s emotions can change very quickly, a fun and nice person who is extremely quirky and energetic, though they sometimes can come across as lame. People who have this name can be mean and violent at times but can also be empathetic and extremely kind. (Just be mindful of what you say to them.)
A Si Yang always knows how to bring the energy and craziness.
by Cloudsarecool November 22, 2021
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