Top Definition
The act of urinating on a woman's head, effectively drenching the hair, and then proceeding to have the woman give the man a blowjob whilst her wet hair is draped in front of her face, ergo dirty curtain.
My girlfriend gave me a dirty curtain last night, and by golly was she wet.
by xXxDolphinClubber69 February 12, 2012

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