Usually thought to be just a group name but to black america it meens a girl with a big, round, full bum.

The word is half english half portugese
fatty meening big in english and koo(spelled differently)in portugese meens ass or butt
YO, check out that chick with the fatty koo!
by Ari East August 10, 2005
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legendary. who needs to kick field goals when you can successfully kick onside kicks while getting the hottest chicks.
i don’t know about you but i think younghoe koo did some ripper magoos before that kick
by rippermagoo069 December 9, 2019
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your fatty koo is what makes you unique and what makes you special or stand out.
Im a great hip-hop dancer. That's my fatty koo.
by F.S July 11, 2005
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when an individual decides to cook up a booby for lunch specificly wrapped in foil with bbq sauce drizzled on top.
"I'm going to a boob-a-koo"

"my wife just got a boob-a-koo"
by Davey Goober September 22, 2006
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a girls big butt (the group fatty koo defined it as such)
Damn, she gott a fatty koo!
by Jasmine K. July 30, 2005
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