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An Aussie slang used to define a fat person.
...Dr Rudi endorses fattening up one's daughter to prevent boys from wanting to have sex with her because "It's better to have a fatty boombah in the family than a filthy slut;"

From Australian TV program Life Support
by vjwpf December 07, 2006

Words related to fatty boombah

fat person slang tv unpolitically-correct