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Abreviation for go fuck a dead horse.
example one:

Bitch faced snake "You're such a xavier. I'm going to tell everybody!"

Lost friend "Actually NO I AM NOT. You are mistaken! GFADH!"

example two:

Dan the man "I broke up with GF."

Bitch faced snake "Xavier"

Dan the man "GFADH"
by shuga me June 04, 2010
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