Milk Boxing Share definition Flag The process of using a straw to suck out the semen from any bodily orphice. "Dude it was badass, last night i had a 3-some, and when we finshed i thought the chicks were 69ing, but they were milk boxing dude!" Milk Boxing by rhoadsnake June 25, 2008 0 0 Get merch Get the Milk Boxing mug. Buy Now — $32.95 See more merch