Top definition
The euphoric happy feeling that accompanies a stomach that is very full after a good meal.
Oh... my stomach hurts, that was sooo good, I'm so fat happy...
by fatquix March 10, 2010
Happy St. Patties Day!
A female that is still very attractive even though she is overweight.
Example: My friends are a bunch of fat happy's, they still look good even though they're fat.
by Moquerie December 20, 2007
Happy St. Patties Day!
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