moo

noun2

1. •
   The characteristic lowing sound made by cattle.
2. •
   (slang, offensive) A foolish woman.

   • You silly moo! What did you do that for?

exclamation1

1. •
   The characteristic sound made by a cow or bull.

   • The cow says moo.

verb1

1. •
   Of a cow or bull, to make its characteristic lowing sound.

noun4

1. •
   Initialism of MUD, object-oriented.
2. •
   Initialism of matter of opinion.
3. •
   Initialism of massive overdense object.
4. •
   (old-fashioned) Initialism of Money Order Office.

   • It was to help solve a serious problem – mice. For the little vermin were chewing letters containing banknotes and postal orders, especially at the Money Order Office (MOO). — 1993