The Yugoslav Attack in chess is White's most dangerous answer to the Dragon Variation of the Sicilian Defense, in which an unsubtle attempt is made to deliver checkmate along the h-file to Black's castled king.
White develops quickly, castles queenside, and launches his kingside pawns forward, often sacrificing one or two of them in the process. Material considerations are secondary to speed in this line. Black retaliates by placing one or both rooks on the c-file, often sacrificing a rook for White's knight on c3, and attempting to mate White before he gets mated first.
Without a doubt White's best reply to the Dragon, but some White players avoid heading down the main lines of the Yugoslav Attack because longtime Dragon players specialise in learning unreasonable amounts of the theory behind their favourite opening, and will more often than not be better prepared than their opponents.