From Longman Dictionary of Contemporary Englishking-sizeˈking-size (also king-sized) adjective 1 BIGvery large, and usually the largest size of something a king-size bed king-sized cigarettes2 informalBIGSTRONG FEELING OR BELIEF very big, strong, or extreme a king-size headache
Examples from the Corpus
king-size• a king-size thirstFrom Longman Business Dictionaryking-sizeˈking-size (also king-sized) adjective [only before a noun] the largest available size of a particular productThe duty system greatly favours the king-size brands of cigarette. 