I love T-ara N4's new song, my favorite part is the "Why you hatin'?" part. Whenever someone insults, or annoys me, I now always say:

Person: You're Ugly

Me: Why you Hatin'?

Person: You're annoying

Me: Why you Hatin'?

Person: Go F. yourself

Me: Why you Hatin'?

Why you Hatin' works wonders in any situation, it really gets people mad. ^-^