A person who fills their bong up with a musky mixture of breast milk and their own semen. The Milky Hitter then proceeds to smoke marijuana out of it, only clearing the hit once the smoke matches the milky whiteness of the bodily fluids within.
“My friend john is what we call a milky hitter, he fills his bong with his wife’s breast milk and busts a wicked load inside of the bong as well. I don’t know how he smokes out of it like that, it’s absurd”