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1.
The name for a sexual partner who is significant, but not at girlfriend status yet.
Meet my Mooba, Pauline
by dinks141 October 27, 2010
 
2.
Basically the word is substituted for bitch in sentences. This is esspecially good in the presence of people you wouldn't normally like to swear in front of.
Emma: "God she's the biggest mooba!"
Alex: "I know, I just wish she'd go f*** herself!"
by Alex who is not ne of these December 30, 2005