Talking Points Memo’s Josh Marshall is probably responsible for starting the trend earlier this year. As the article noted, the nickname Elmo had been used to refer to the Tesla CEO at least since 2018 but it was never widely picked up until he announced that he was buying Twitter earlier this year.

Independent journalist Marcy Wheeler who goes by the name emptywheel had been previously credited for the nickname’s popularity but she denied it saying she picked it up from others.