"Nuttered" isn't a word, unless you are referring to "neutered" or "nutty". Cows are not neutered, bulls are, so the phrase "a cow is neutered" is absolutely meaningless. It does take on meaning though, when saying that a cow is nutty. This generally means that a cow is aggressive to the point of "blowing snot down your back pocket." Or sending you over the fence with her snorting on your heels. Nutty cows are the ones to look out for.
It could mean that a cow is ready to give birth.
A breaching cow could mean a cow that is calving out a backwards calf.
It means laugh out loud cow.
No, a crayon is not a cow but unless you mean a different kind of cow then I have no clue at all.
A cow pat, cow pie or prairie muffin is cow dung in its natural state.
Marra mean mother of a cow.
lots a cow
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Cow
Bovine refers to a cow. I'm not sure what they mean by half cow.
Cry like a cow means you sob for ages
Best cow means exactly what it says. Best cow being actioned off.