'훗' is actually the word you sniff or snort with laughter when someone does make you feel absurd or like you want to look down on them. In their lyrics, you can see what I meant. Her guy always look other girls even she's with him. So whenever he does she's like 'even you do those terrible things to me thou, I tried to give you a second chance and watched for another chance to confront. You treat me like nothing but I am aware of everything and I am not going down' sorta attitude. '훗' is the word which is after the sound you snort with laughter when someone does or says a thing doesn't make sense to you. Hope it could be a little help to you. Good day. :)