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2.
An extreamly fat human.
That girl with the kankles is fatty fatty boom batty
by alisha November 29, 2002
 
1.
Also used in drug references
"I'll tell you what you need is a fatty boom batty blunt, then you'll be seein' a sailboat, an ocean, and some of those mermaids doin that lesbian shit!"

-Jay, as played my Jason Mewes
by Double Threat January 16, 2004