One of the synonyms for the word "most milking" is "most exploitative." This term refers to a situation in which someone is taking advantage of another person or group for their own benefit, often at the expense of the other party. Other synonyms for "most milking" might include "most draining," "most exhausting," or "most demanding." These are all terms that suggest a situation in which one party is taking more than their fair share or requiring a disproportionate amount of effort or resources from the other party. Alternatively, one could use the term "most lucrative" to describe a situation in which one party is making a lot of money or reaping significant benefits from a particular arrangement.