Kakakaka - A word that has four K's and four A's, which is probably why

A word that has four K's and four A's, which is probably why it sounds like a mad man is screaming.

Kakakaka, said like it was the last word in the dictionary before it explodes.

My friend tried to say it and it sounded like a goat with a headache.

I wrote it down and it looked like a goat threw up a keyboard.