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1.
the roll of fat that rests on your head when you blow a fat guy
I love getting a fat hat, even if it means I have to wear a neck brace and stop riding roller coasters
by Sally Popkorn April 15, 2008
 
2.
the condition of having excessive head fat; being fat to the point of impossibility.
"Would you like fries with that, fathat?"
by Brand August 31, 2003