Dirty Sif Share definition Flag When you nut in a girl's mouth in the bar bathroom and she gets called up to Karaoke before she can swallow. The girl I met at the bar just sang "Hero" . Pretty good for a Dirty Sif. Dirty Sif by Jezykajo September 8, 2021 0 0 Get merch Get the Dirty Sif mug. Buy Now — $32.95 See more merch