Kos Kardan Irani Updated ⏰

The phrase you mentioned is a transliteration of a highly vulgar Persian term referring to a sexual act. However, in some academic or sociolinguistic contexts, researchers use such terms to explore the intersection of language, taboo, and societal power structures in Iran. 

Etymology: Briefly discuss the historical roots of common Persian profanities.

"In dars ro kos kardan?" Translation: "Did you 'kos kardan' this lesson?" Real meaning: "Did you completely botch/fail this lesson?"

“He said he was in Turkey until Sunday!” Maziar hissed, scrambling to his feet.