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1.
Yafook is an arabic slang that was made in lebanon by taking the two words "ya" (you) and "dafook" (idiot) and combining them into one word making the greatest word in the world
steven: oh crap im such a yafook!

edward: HEY YAFOOK GET BACK HERE
steven: im sorry i didnt know i wasnt aloud to steal your sandles
by morlapado July 04, 2011
 
2.
a mixture of 2 hebrew words
ya+dafook=yafook
meaning you dumbass or you idiot
lebanese said to the morocan ‟you want to buy some labne?‟ the moroccan replied ‟ yafook, i dont wanna blow up‟
by moroccanman8 July 05, 2011