"Cool" is "간지나다"(kan-ji-na-da) in Korean.
Ganjinada (간지나다) is a slang that is used to center the young people. 간지 (Ganji) is being used in the context of the word "feel" has been considered a etymology. The word meaning man has pond, called "Ganjinamu (간지남)" and the word "Ganjinyeo (간지녀)" to be used against women, is used as a compliment.