Refers to the rear end of a person (usually a women) with a very fat wobbly arse.
"You have a very fatty batty ses I!"

"LOOK AT THAT FATTY BATTY"
by Jason Winder May 4, 2006
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The apple shaped, bell bottom, part of your ass that hangs out the side of a thong.
Ey Fatty, you got a nice fatty batty.
by No middle name fatty. October 21, 2009
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A cannabis joint of unruley size. Usually pertaining to a double papered joint that while of regular length has a disproportionately wide girth.
Yo, I just rolled up a fatty boom-batty jay of this skunky ass weed yo! Were gonna get so high...yeah!
by ChunkyD August 15, 2006
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n. a spliff
"We went to a bar and smoked a fatty boom batty"
by Ads February 13, 2003
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A large, marijuana, blunt that has taken the shape of a baseball bat.
If every one puts their weed together, we can roll a "Fatty Bo Batty"!!!
by Will C05 January 22, 2009
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The king of all joints.Long and fat rolled by hand using rips. containing tobacco and a whole lot of weed
yo, boss you gonna roll another fatty bomb batty coz there's some fellas comin' and regular aint gonna do it.
by happy buddah July 14, 2006
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