adj. Excessively rich, fattening, gluttonous, or unhealthy, often referring to food. Also, the feeling one has after consuming such food. Fattycatty can be used as both a positive and a negative.
Negative-- wife: "Let's get a pizza for dinner tonight"

husband: "Nah, I'm feeling a bit fattycatty.

I had pizza yesterday and a philly cheesesteak

for lunch."

Positive-- "This philly cheesesteak is the bomb. It's fattycatty like a cheesesteak should be"
by ecduke June 09, 2010

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