کس

What it means

کس (kos) is the vulgar Persian word for vulva or vagina. The neutral medical term is واژن (vâzhan) and the polite euphemism is آلت زنانه (âlat-e zanâne). Kos is the street word, and unlike kir it carries the additional weight of being both anatomical and the engine of an entire family of compound profanities.

Where it comes from

Pure Persian, attested in classical poetry’s bawdy registers and continuous in spoken Persian for centuries. The word was not always as charged as it is now; the modern register hardened around it as Persian profanity professionalized in the Pahlavi and post-revolution eras.

Who deploys it

Iranian men in tight male peer groups. Tehrani youth, sparingly. Persian rap (uncensored on diaspora platforms). Diaspora Twitter and Iranian satirical accounts. The word almost never appears in Iranian state-licensed broadcast or print, and women using it pay a higher social cost than men.

Who it lands on

Directed at a woman, kos is one of the most aggressive things you can say in Persian. Used as an exclamation (“kos-am,” meaning “my pussy” or “fuck me”), it lands on the speaker’s frustration. Used in compound form, it lands on whoever or whatever the compound names: kos-kesh (asshole), kos-khol (idiot), kos-she’r (bullshit), kos-magh (absurdly empty office, said of state officials).

The mechanics

Kos is generative. Few profane roots in any language produce as many living compounds. کس‌شعر (kos-she’r, “cunt-poetry”) means bullshit. کس‌مغ (kos-magh, “cunt-position,” sometimes spelled kos-magham) names a useless inflated office, frequently aimed at state appointees. کسم (kos-am) is exclamatory frustration. The morpheme is so productive that learners need to recognize it just to parse half the spoken-Persian profanity around them.

Editorial note (in our voice)

Note the asymmetry: kir generates aggressive compound dismissals; kos generates the entire shame-and-bullshit-detection vocabulary. The Persian profane lexicon does not weight male and female anatomy equally, and that imbalance is itself a piece of language data worth seeing clearly. We document the word uncensored because its compounds are unavoidable in any honest map of spoken Persian.

Why it’s in the glossary

Because half of Tehran’s everyday profanity routes through this morpheme, and a learner who only knows the polite registers cannot read kos-she’r or kos-khol when those land in conversation.

How you’ll hear it

• Frustrated speaker at a problem: «کسم، چطور این رو نفهمیدم» (kos-am, chetor in râ na-fahmidam) “fuck, how did I miss this.”
• Dismissing political talk: «کس‌شعر می‌گه» (kos-she’r mige) “he’s talking bullshit.”
• Persian rap chorus: kos-derived insults are common percussive material.

References

• Dehkhoda Dictionary: کس
• Persian rap and satirical-press corpus (Tehran underground 2000s onward)
• Obeyd-e Zâkâni satirical tradition for historical attestation