Very large female breasts.

Breast that look like there filled with milk.

Suckable breasts.

A Milk Cow is a female bovine specifically breed to maximise milk production for human consumption, typical attributes include large udders. The Milk Cow starts to lactate (produces milk) after her first calf and to maintain lactation is breed periodically to produce other calf’s.

A Milk Cow is also a BDSM / Fetish term for a submissive female, typically is a Master / submissive relationship dynamic, who breasts are encouraged to become enlarged by the continual production of milk.

Having a guy ejaculate.

Made more famous (recently) by Ludacris' song.

When a girl is sucking a guys cock, while pulling on his balls one after the other until he shoots cum repeatedly in her mouth.

Grabbing and groping a guy's tits named todd

Milking the cow can be used to describe attaining the absolute most from any given situation.

Sometimes called 'milking the cash cow', 'milking the cow' can also be applied to any franchises which continue to drain the public of as much cash as possible and attempt to attach the brand name to absolutely everything, be it cereal, video games, car adverts, tshirts, bedsheets, plush toys, action figures, computer accessories or anything else that would be seemingly unrelated.

When a "non-farmer" city guy goes to his room to masturbate.