Nick: “What’d you do when you were in Japan?”
Wyatt: “I went on a milk run”
Nick: “What’s that?”
Wyatt: “I went to a convenience store and grabbed a gallon of milk and a bag of chips on my way home. I chugged half the gallon and then my hook up called and asked me to come over. So I went to her place, had sex for 5 minutes, and chugged the rest of the gallon on my way home”
Whenever you don't have any lunch money and you go around the lunchroom asking people for the things they don't want so you can get something to eat or drink.