Hull or Heol is an expression used when someone annoy, bother, or simply does something that you can’t believe.. *Heol* is used as a sigh, like i cannot believe you, or are you serious. Is simply used to express how you feel.
야! 이봐요. (ya! i-bwa-yo.) Hey! Look.
헐, 너 진짜 누군데? (hull, neo jin-jja nu-gun-de?) omg, who do you think you are?
*Also notice that this word is mostly used between teenagers and early to mid twenties… So please don’t use it with an adult, because they will get really annoyed and probably will scream at you… (well if they know what the word mean). Also this is a word from the everyday slang.