Beef Knuckles Share definition Flag When a girl has her pants pulled way up, and you can see the outline of her beef curtain. Dylan: Did you hear that Hunter fucked Kassie?Kody: Ewww, she has beef knuckles. Beef Knuckles by DildoNelson April 12, 2010 0 0 Get merch Get the Beef Knuckles mug. Buy Now — $32.95 See more merch