If you have watched any K-drama, listened to K-pop, or hung out with young Koreans in Hongdae or Seongsu-dong, you have definitely heard two iconic single-word exclamations: Dae-bak (대박) and Heol (헐). These two words form the absolute backbone of modern Korean conversational slang. While textbooks often focus on formal vocabulary and polite grammar, everyday spoken Korean…