Contraction of the phrase 'are you in?'
Congruent response to this question is 'Min'
- 'Yin?'
- 'Min!'

- We're all going to the Christmas market for a few drinks, yin?
by Frodus Bonobus November 12, 2009
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A manager in BadBoyHalo's Discord Server. He abuses his power a lot and uses old photos of himself to come off as a young gentlemen when he's actually 50. If you ping him you'll be sentenced to death.
Shrek: *Pings Yin*
Yin: You piece of shit who do you think the fuck you are. *Mutes Shrek*
by Fingerguns8890ip December 24, 2019
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A combination of You and all / ya'll, widely used in Pennsylvania.
Are yin's still coming over to eat today?
by Pyroalphamale March 10, 2009
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A lady that is very sweet. She is pretty classic.
Yin: "O hAI Ian"
Ian: "That is a Yin moment"
by oookookkok January 14, 2021
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A yin is someone who hates musical theater in all of its forms and will go out of their way to shit on it.
I was trying to listen to Hamilton, but Steven got so pissed he cut off the WiFi, never knew he was such a yin.
by Sen. M June 18, 2020
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A variation of the word you all, you, yous guys, and y'all. It is also used widely in the south.
When are yins-a-coming to see us down nywa?
by Carter SN October 01, 2005
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Slang for Young. Can be used to greet someone you dont know or dont like.
Yo,Whats up yin?

Yo yin you best step off unless you want to get Shoe stole.
by FURG March 11, 2005
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