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A fattock is a rotund, larger friend within a social group that always eats too much and often orders the most food when eating out etc.
Simon: Marc, why have you ordered SO much food... it's 10am?
Marc: *insubordinate yelping and denial*
Simon: You're such a fucking fattock.
by mumpaidforthis August 19, 2014
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The buttocks of a grossly obese individual. Most often a ghastly and unnerving sight to behold
Crikey me! Look at the fattocks on that Mc Donalds addict!
by [Harry^Hardcore) June 21, 2007
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