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1.
Fuh-daa-shih!!!{Fuck dat shit}

A southern, especially Atlantan way of proclaiming disaqreement with a situation.
Dude1: Ay Ni, wuh mah meny et(Hey nigga where my money at?)????
Dude2: Man, Fuhdahshi!!!!
by Orenjello September 13, 2007
 
2.
Derived from the phrase, "Fuck that shit". You can use it whenever you don't give a fuck or a shit or both.

Fuck that shit-> fuh dat shit-> fuh dah shit-> fuhdahshi.
John: DUDE! Look at that chick she looks like she's in trouble!
Bill: HUh? oh.. fuhdahshi.
by Supraman352 June 27, 2008