Definitions by Dr. Westfall.

FDSy 

FDSy means, F*** dat shit yo, meaning you ain't down for what you're being asked, or if you think somethings stuff. When saying in person you're supposed to have emphasis on FDS and say y calm.

"That girl wants yo nuts."

"hahah FDSy"

FDSy by Dr. Westfall. September 15, 2009