when a boy is recieving a blow job, the odd man out ejaculates all over the girls back, unsespectedly, to create the illusion of delivering dirty milk.
Derek is getting head, and Paul cums all over the girls back, thereby creating The Dirty Milk Man.
Dirty Miley means means musty ass bitch that gets bullied by her brother it also means she is the greatest person ever even tho she do be mustysometimes
When you cum in an exactly four month old milk bottle then you let it ferment for another four months, and make a smoothie with it, and give it to your friends.
"HeyJack what are we having tonight." "Some dirty milk bottles."