Ieroween 

A word commonly used in the place of Halloween by My Chemical Romance fans. It is stemmed from the birthday of rhythmic guitarist Frank Iero on the 31st of October.

Person: Happy Halloween!!
MCR fan: Suddafuckup, it's Ieroween!!

MCR fan: Happy Ieroween, Frankie!! How old are you today?
Frank Iero: Iero-what??

Ieroween by iamamonster November 19, 2007

Ieroween 

A word commonly used in place of Halloween by fans of the rock band My Chemical Romance because the rhythm guitarist Frank Iero’s birthday happens to fall on that date.

MCR Fan: Happy Ieroween!!
Sane Human Being: Huh? You mean Halloween haha.

Ieroween by BooklovingLondoner October 31, 2021