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Australian slang used to exaggerate size and imply a negative conotation. Usually considered a derogatory term and is most often used in relation to someone who is morbidly obese. To be grammatically correct the term may either be: placed immediately before a size related adjective e.g. That port-a-loo is vellis big; or used as an adjective e.g. He's so fat, he's vellis. Terms is possibly derived from large beast described in ancient Greek mythology.
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