Moo Moo Milk is a milk company that was first seen in SMG4: Mario Goes to the Fridge to Get a Glass Of Milk.
When Mario and Toad were trying to find more milk (since the last milk carton in a grocery store blew up a few seconds after it hit Shroomy), they saw a truck that had the company name on it, which had Luigi driving in it. However, when Mario and Toad tried to chase it, the truck fell over, which caused all the milk to fall out of the truck. Luigi was worried that the company was going to fire him, only for Mario to decide they should go to the Moo Moo Milk factory. After knocking over a tank, Jeeves becomes furious and disciplines the three by sending them to a farm and forcing them to make more milk.
It appears again as one of its café branches, set as the conflict location between Mario (selling lemonade to pay back the Anime Cartel) and Jeeves (who was feeling vengeful over what happened to his milk factory). At first, Jeeves nicely asked Mario to take down the lemonade stand but Mario refused so he called for his guards to take down the stand. That resulted in a huge fight between Jeeves' employees and the Anime Cartel.