Cow refers to a fat queer woman. It is important to note that "cow" and "fat cow" have historically been used as insults against fat women, and this term should only be used by women that reclaim it for themselves.
A young cow is called a calf.
History
The term and it's flag were created by razzytism on March 26th, 2024.[1]
The calf flag was created by Tumblr user menhira on an unknown date.[2]