Top definition
To be a "fat-Catherine, Cathy, or Cathryn" hybrid. One becomes a Fathryn by 1.)being fat and 2.)being named Cathy.
Cathy really needs to put down the Krispy Kreme donut or she will become a "Fathryn".

Q.How many Fathryn's does it take to screw in a lightbulb?
A.No one knows because she will eat it first.
by mzpumpkin84 August 27, 2008
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