It just means you can hear the cow chewing whatever she's eating or chewing her cud.
Ruminate.
a cow chews the grass it is eating thoroughly and slowly, so it is chewing it's cud - the masticated grass in it's mouth. - that's where the expression for long, contemplative thinking when trying to solve a problem comes from.
If you are asking why they call it that, it could be because some people look like like they are chewing their cud while they are chewing gum. Cud it regurgitated feed that the cow then rechews.
A cow will eat grass and then swallow it , then after it has been in their stomach for a while they will then do a bit of a reguritation or throw up and then re chew that grass this is what is called their chewing of the cud
chewing cud is mostly done by cows, goat, sheep etc. this takes place in RUMEN . 1st it eat's the grass , after sometime it sit's comfortably , the rumen helps the cow to make the cud come back in it's mouth then it will chew it , this process ; the cow will do it for a long time.
She's just relaxing after a few hours of eating grass or hay, and chewing her cud or the feed that she didn't have time to competely chew when she was busy eating. Cows like to have their quiet times too.
Cud. Cows regergitate grass and it is call cud. Hence cows chew their cud.
A donkey is NOT a cud-chewing animal.
"The cow chewed its cud." Cud (noun), partly digested food returned from the first stomach of ruminants to the mouth for further chewing. A ruminant is an animal that has a stomach system such that it chews its cud. This includes cattle, sheep, antelopes, deer, giraffes, and their relatives.
The technological term for the process in which a cow regurgitates its cud and chews it is called "rumination." Rumination allows cows to further break down and digest their food by re-chewing it before fully swallowing it for final digestion.
They stand around in mud chewing their cud and get milked.