Derived from the french word 'moutard' which means 'kid' but in a more negative way...sort of like a brat.
But with this spelling it's more of a retarded kind of childishness.
The proper way to say this word is with your hand bent at the wrist and slapping your chest when you say the 'moo' part, like a retard would act.
intelligent_person: get the hell out of here, you mootard. that isn't what real hacking is about.