Can anyone make sense of this?

As far as I can tell, the katakana reads "BAAchkovaronnu!!!!"

What the hell does that mean?! Is it a pun? I know the Ba with three lines instead of two is deliberate by Oda-sensei to denote the destructive power of Iva-chan's winks, but it still doesn't make sense to me.

I hope someone can shed some light on this.