Iowa scream

A way of describing a scream or roar that was significantly angry or vicious. its called the Iowa scream because the lead singer of Slipknot Corey Taylor, would legitimately scream and yell during the recording on their second album titled Iowa, instead of using screaming methods, resulting and a significantly angry and violent vocal delivery that permanently damaged his voice.

"dude, mike lost his shit last night"
"i know right! he pulled an iowa scream and everything!?