Mooed

from The Collaborative International Dictionary of English v.0.48

Moo \Moo\ (m[=oo]), v. i. [imp. & p. p. {Mooed}; p. pr. & vb. n.
   {Mooing}.] [Of imitative origin.]
   To make the noise of a cow; to low; -- a child's word.
   [1913 Webster]