Top Definition
People (or animals) that are hilariously fat and are therefore extremely amusing.
Dr. Phil: Welcome our fatastic guest Abby. She weighs 650 pounds and was air lifted into our studio this morning.

Abby: Thank you Dr. Phil for having me on your show. I would like to give a shout out to my fatastic husband and fatastic family.
by Fatastic Abby July 30, 2006
Fantastically fat.
Jena weighs 200kg, she's fatastic
by raffik August 01, 2008
The buzz you get from taking diet pills. It almost makes being fat fun.
I was fatastic today the way I was zooming around the house cleaning, like a plus size tornado. I don't know if I lost any weight, but I feel so great I almost don't care.
by MadamexXx March 03, 2009
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