i Register
In some senses, moo is marked as derogatory, slang, dated, UK. Watch for register when choosing this word.
noun
The characteristic lowing sound made by cattle.
A foolish woman.
You silly moo! What did you do that for?
'Aurora House does not expel,' said the sanctimonious moo, 'but you will be medicated, if your behaviour warrants it, for your own protection.'
verb
Of a cow or bull, to make its characteristic lowing sound.
intj
The characteristic sound made by a cow or bull.
The cow says moo.