Abracadabra for me , you don't get such an iconic song every day. It's a song that was a staple for years, i can remember the first lines every time i think of it. When someone says Brown Eyed Girls i automatically think of this song.
I like Sixth Sense, but after what happened to poor lovelyz i can't listen to it without remembering :( I miss them
According to my taste Sign should be my favourite song, but it's not as ICONIC.
Kill Bill is the LITERAL Female empowerement song imo, at least for me.
Brave New World has an amazing chorus, best in their career imo, but the prechorus is too weird...