Chilk is a slang term for chocolate milk. (ch)ocolate m(ilk). Chilk is great for any occasion, and has been proven to be a great recovery drink after workouts because of its high protein, calcium, and water content.
Chilk can be bought in single bottles, but is better enjoyed straight out of a gallon jug.
My legs were throbbing from running 50 miles barefoot across that lava field, but I chugged some chilk and am good to go now.