Top Definition
Hitting the dirty pillow is when you have unprotected and unwashed anal sex with a woman who has a BMI above 30.
Friend 1: Wow, you were totally hammered last night.

Friend 2: Yeah, the night only got worse... After my 9th Long Island, I grabbed a cab and started cruzin outside of the Lane Bryant outlet and picked up a fattie. I totally took her home and hit the dirty pillow.

Friend 1: Yuck! you sick fuck!
by TmVv January 20, 2010

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