cis
Cisgender (opposite for transgender). People who like the gender they were born with.
Emma: Seriously, all these tumblr users using a bunch of wierd words... Like what is ''cis''?
Veronica: Cis means liking your gender you were born with, I am cis. I was born a girl and I like being a girl.
by SirahHuxley August 05, 2015

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cis
An improperly used latin prefix, used as the "opposite" of "trans." Almost exclusively used in the compound phrase "cisgender" to refer to people whose biological sex matches their mental gender -- i.e., normal people. Can also be shortened to "cishets" to refer to people who are both normal and straight.

Near universally used in a derogatory fashion as a slur by people who think being normal is somehow oppressing them. Typically a warning sign of a Social Justice Warrior or unhinged LGBTQ activist.
Cisgender gay men and lesbian women have as much trans blood on their hands as cishets.
by Xython May 16, 2016

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cis
Abbreviation for "'cause I'm stupid." Anytime you hear the word CIS come from someone's mouth in any manner other than derision for the very term, that person is admitting, in code, that he or she is stupid.
Ben's a sissy.

You mean a CIS?

No, idiot, I mean a sissy.
by BigBadMrReality May 29, 2016

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CIS
CIS is an abbreviation for the term "Collective Information Source".

A collective information source is an educational resource with information specific to a certain subject; it is usually held in a binder or folder.

A CIS can be created for general educational purposes, as a place to gather ones arguments during a disagreement, or out of pettiness.

This abbreviation is not to be confused with any of the following:
Cisgender, The Center for Immigration Studies, The Commonwealth of Independent States, The Council of International Schools, The Center for Internet Security, Canadian Interuniversity Sport, The Corpus Inscriptionum Semiticarum, Carcinoma in situ, The Center for Comparative and International Studies, The Knabenchor collegium iuvenum Stuttgart, a continuous ink system, a copper indium selenide solar cell, a contact image sensor, The Confederacy of Independent Systems, the towns in Italy and Poland, the mathematical function, the Cis beetle, cis regulatory elements, cis isotope alkenes, cisalpine, and the C# music note.
She disagreed with him so much that she created a CIS to give to him.
by PettyCrocker June 28, 2016

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cis
Short for cisgender. Someone whose gender is the same as the gender they were assigned at birth. Not transgender.
Derek is male and he was assigned male at birth, so he is cis. Tracy was assigned male at birth but she is female, she is not cis.
by JosephineAda January 17, 2017

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CIS
Acronym for Character Induced Stupidity. Commonly used in comics or anime/manga when the writer injects ridiculously stupid mistakes that may well be against the established canon of a character's history for the sake of advancing the story.
Ash Ketchum constantly receives CIS by releasing his strongest Pokemons every season and lose to the Pokemon League again and again and again.
by Wild Guest July 13, 2016

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Cis
Short for Cisgendered. A label used by trannies, ultra-liberals, and feminazis to designate normal, non-mentally-ill people.
"Die cis scum" - Radical tranny retards.
by Anon5111605 September 25, 2013

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