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2.
A group of obese people, or if a single person is astonishingly obese the word may be used to describe in the singular.
Look at those fattle being herded into the casino!
by Charles Bronson November 11, 2005
 
1.
A group of overweight people.
A herd of extra large persons.
I was trying to get from one side of the mall quickly but I was slowed down by a large herd of fattle.

I was almost crushed by a stampede of fattle when the store opened it's doors on black Friday!
by Chopswood November 20, 2010