کیر (Kir)

"dick, cock"

The standard vulgar Persian word for penis. Like 'kos' (vagina), it's a root word that generates an entire profanity family: 'be kiram' (on my dick = I don't care), 'kiri' (dickish = shitty), 'kir-e khar' (donkey's dick). On its own it's simply a crude anatomical term, but its derivatives power much of Persian vulgarity.