1 definition by Australian's Dictionary

A number out of 10, 1 being mildy over-weight and 10 being so fat you lye naked in your bed all day waiting for a fire crew and paremedics to feed you then hose you down, followed by the word fat, to describe how fat someone is.
Employee: Ohh my manager Matt is soooo fat!

Friend: How fat?

Employee: 5 fats! 5 fats Matt.

# fats.
by Australian's Dictionary August 24, 2008
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